Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc736fc9606518c…

MALICIOUS

PDF

79.5 KB Created: 2020-08-06 05:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 863e3e850c6c87acff63d6c323c50ffc SHA-1: 9f2d7396234ad0236c5b78cae3ff1e386f52c055 SHA-256: 3dc736fc9606518c7693196d97c05678a7c8b20178dd14e48a95d0f5df19fbf2
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm for SEO manipulation. One of the primary links, 'https://ttraff.cc/wb?keyword=hardware%20maintenance%20manual%20lenovo%20t410', is flagged as a malicious redirector. The document body, though partially corrupted, contains text related to a hardware maintenance manual, suggesting a lure to entice users to click the malicious link. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.cc/wb?keyword=hardware%20maintenance%20manual%20lenovo%20t410 In PDF document text
    • http://files.excelbusinessintelligence.com/uploads/1/3/1/3/131380845/333d30d.pdfIn PDF document text
    • http://files.brentcue.com/uploads/1/3/1/4/131482916/nosubozunisagosatuji.pdfIn PDF document text
    • http://sinod.alienspacemonkeys.com/uploads/1/3/1/3/131381679/xobarupamidapob.pdfIn PDF document text
    • http://files.elkfordcurling.ca/uploads/1/3/0/9/130969192/b98df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/lovubasumaguza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5254/7739/files/zawoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5053/2001/files/kinitojuve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/77294633775.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2118/9788/files/nowamosonajabej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7921/8840/files/56668702608.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/88075317933.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4349/5841/files/86140694809.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1301/2636/files/lemozogi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5040/1945/files/natebiliwawutolug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9869/3013/files/pyrolysis_gasification.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
🗂 Part of campaign: elkfordcurling.ca 4 samples

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 5300 bytes
SHA-256: fdcc5c0be73dca95ddc9d47fb6c61e85c8292fd9d0f266dde883b222e209af5c
font_01_sfnt_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 15940 bytes
SHA-256: ddbf740da0ef905bfa2dc042545f07d01728ef3f0e84c6095fee4c2659a55f43
font_02_sfnt_off00011b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B89 16080 bytes
SHA-256: a23d6b0e1f044af2ecf8dc4372f224102370a4a94617cb3c5804d154822908ba