Malicious PDF — malware analysis report

Static analysis result for SHA-256 37696b81aa78a2d1…

MALICIOUS

PDF

108.8 KB Created: 2020-09-09 12:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d0651a6f63c3d4fb8aeb8dd371916d4c SHA-1: 103ae507ba0bb41a0b125ff3d88d33e62d5f2301 SHA-256: 37696b81aa78a2d133d57c48c1fc5036f8f289a8acafeb01a34ca408e57d5b8d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to redirector infrastructure, specifically `https://ttraff.com/wix?keyword=brokeback+mountain+annie+proulx+pdf+espa%25C3%25B1ol`, which is flagged as malicious. The document body also contains this URL, suggesting it's the primary lure. The presence of numerous external PDF links indicates a link farm, likely for SEO manipulation to drive traffic to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wix?keyword=brokeback+mountain+annie+proulx+pdf+espa%25C3%25B1ol In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://static.usrfiles.com/ugd/b65acf_138d1123de564b50915a71d9be87d14c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/70094d_c638f1c081644869a6614c97e7904b64.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3b7182_03d9facab5fa4923b566ecd1f42cd3d6.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0862/1719/files/89232043731.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9816/7709/files/xulifol.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/dcfb95_40696bc6059c429c919328d118a0a3d1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1e52da_ac8d24ada53642a0bf36bea74b0eee16.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/362633_a9fa96b594b04be28ad9c7a8e8c84837.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8ab72e_1d3651964d7d4f6183f471d2ddbd74ed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/5744/7839/files/boston_marathon_2019_race_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4403/5993/files/muxaxuvotusugobatizaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/6351/9906/files/akuntansi_biaya_buku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6099/9830/files/95672438264.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/8689/7313/files/46799381345.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.orgIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0001407f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1407F 25464 bytes
SHA-256: 277e358ddcd1cdc40ef2552fa1928470ce0bf2effd72da034660c106639b2913
font_00_sfnt_off0000cfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEF 3312 bytes
SHA-256: 19fe6d3511270ee3ff4fbce704f5f4a9fb9182a4344e37e40a38d55828b07e20
font_01_sfnt_off0000dbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD0 5832 bytes
SHA-256: 453a375646d083e6a51965f9c41692e0eb4762da93d57f3a1d4ee02a5f6779d0
font_02_sfnt_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 10860 bytes
SHA-256: 567c7b5e772947797da48ddb6999289df0a27de1382e683fde053bbe6d75bd53
font_03_sfnt_off00010db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB1 16948 bytes
SHA-256: a03c825543a1ab7e082d10fdc94b6f0399a0fd4f5546bb25d914e290d0174d7d
font_05_sfnt_off00016da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DA4 7840 bytes
SHA-256: 4848e04f0f3163a7e8939b1c5ee3229a6341d4649f3d00748b806f2471e763a0
font_06_sfnt_off00018852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18852 8268 bytes
SHA-256: 8b8a2236e295782b9cb7fe07f366478938d0e1ccc41a7900ebdeeb92f5ef3662

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