Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18421c3d6130b45…

MALICIOUS

PDF

41.1 KB Created: 2020-08-09 14:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5242f8e8488429b6d4cd969613fa5bab SHA-1: 2e9649a9f83b52d5199cbecfb6401e9f6a7caad9 SHA-256: d18421c3d6130b450131ba7cde942488dbd7b568c0e9f38613d6f89dd6c10aea
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one pointing to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains text related to 'administrative law text book pdf' and the wkhtmltopdf generator, suggesting a lure to download a fake PDF. The presence of a link farm heuristic further indicates malicious intent to drive traffic to potentially harmful sites.

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.ru/pify?keyword=administrative+law+text+book+pdf In PDF document text
    • http://files.jonathanlumsden.com/uploads/1/3/1/6/131636737/da0773d92.pdfIn PDF document text
    • http://files.westfieldbouncehouserentals.com/uploads/1/3/1/3/131384789/4605166.pdfIn PDF document text
    • http://files.dywborders.co.uk/uploads/1/3/2/3/132303068/lisusomofonakoropub.pdfIn PDF document text
    • http://files.berrybrook.us/uploads/1/3/1/4/131414516/dikivosafogil.pdfIn PDF document text
    • http://files.septicserviceshunstville.com/uploads/1/3/0/8/130814129/5908432.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/1/0433/9469/5318/files/46151551186.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/21561415095.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5443/0368/files/class_attendance_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0945/7825/files/16741717339.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0743/4142/files/ikea_hemnes_daybed_2_drawers_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/526428265.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7677/9174/files/98814838712.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/51927010937.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2078/7613/files/67341165111.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1471/5549/files/aggression_replacement_training.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0346/2303/files/71585713590.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/41758269648.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8719/0430/files/lesenexoboriv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/mitejexisabasazamuwadosar.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6439 5600 bytes
SHA-256: 035d952d868eff1d93e185b5f77d36b358131c53f0024bde8ab594baea9952e2
font_01_sfnt_off00007740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7740 9320 bytes
SHA-256: d01be1ff1a8ee2933701cb9b9cfe0db266912e0248735557a480848865f0af6d