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)
MD5: d0651a6f63c3d4fb8aeb8dd371916d4c SHA-1: 103ae507ba0bb41a0b125ff3d88d33e62d5f2301 SHA-256: 37696b81aa78a2d133d57c48c1fc5036f8f289a8acafeb01a34ca408e57d5b8d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a link to `ttraff.com`, identified as a malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting the primary purpose is to redirect the user to malicious infrastructure. The presence of numerous external links, many pointing to benign PDFs, indicates a potential SEO poisoning or link farm strategy to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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.
  • 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
    • https://static.usrfiles.com/ugd/b65acf_138d1123de564b50915a71d9be87d14c.pdf
    • https://static.usrfiles.com/ugd/70094d_c638f1c081644869a6614c97e7904b64.pdf
    • https://static.usrfiles.com/ugd/3b7182_03d9facab5fa4923b566ecd1f42cd3d6.pdf
    • https://cdn.shopify.com/s/files/1/0434/0862/1719/files/89232043731.pdf
    • https://cdn.shopify.com/s/files/1/0437/9816/7709/files/xulifol.pdf
    • https://static.usrfiles.com/ugd/dcfb95_40696bc6059c429c919328d118a0a3d1.pdf
    • https://static.usrfiles.com/ugd/1e52da_ac8d24ada53642a0bf36bea74b0eee16.pdf
    • https://static.usrfiles.com/ugd/362633_a9fa96b594b04be28ad9c7a8e8c84837.pdf
    • https://static.usrfiles.com/ugd/8ab72e_1d3651964d7d4f6183f471d2ddbd74ed.pdf
    • https://cdn.shopify.com/s/files/1/0459/5744/7839/files/boston_marathon_2019_race_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/4403/5993/files/muxaxuvotusugobatizaw.pdf
    • https://cdn.shopify.com/s/files/1/0452/6351/9906/files/akuntansi_biaya_buku.pdf
    • https://cdn.shopify.com/s/files/1/0440/6099/9830/files/95672438264.pdf
    • https://cdn.shopify.com/s/files/1/0462/8689/7313/files/46799381345.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 7

Files carved from inside the sample during analysis.

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

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