Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4820a46dda0d0e…

MALICIOUS

PDF

44.3 KB Created: 2020-08-15 22:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e48de6efe5aeaa9208719840389c3d1e SHA-1: 54432f4eb15209380d8b89033164ba4a3e4f63ce SHA-256: 7c4820a46dda0d0e948510f58d89e3728bea35d5e4b188f6134d0a4ffb79a223
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to a redirector URL associated with malicious activity. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO manipulation tactic to lure victims. The ML classifier strongly indicates maliciousness, and the presence of redirector links suggests an attempt to lead users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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=what%20is%20community%20engagement%20solidarity%20and%20citizenship%20pdf In PDF document text
    • http://files.utahmicroloanfund.org/uploads/1/3/0/7/130775310/gurexadudedi.pdfIn PDF document text
    • http://files.kilmerschool.org/uploads/1/3/2/6/132681536/4142342.pdfIn PDF document text
    • http://milozup.dartendistrict.com/uploads/1/3/0/7/130775735/a533a344115d.pdfIn PDF document text
    • http://dijefisos.taitcolberg.com/uploads/1/3/0/7/130775125/9b7bad.pdfIn PDF document text
    • http://files.sdra.org/uploads/1/3/2/6/132696351/9360962.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigefuminif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7275/7670/files/15203975704.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8645/3663/files/mixed_addition_and_subtraction_word_problems_3rd_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1020/1499/files/nudimomosaxowa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/wondershareelement_6_professional_arabic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/83240747254.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5933/9679/files/2905850843.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4989/1478/files/jaxatabeju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3096/8480/files/water_pollution_control_engineering.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8758/3650/files/72006911591.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2806/7990/files/sujerewepekemimubitexazep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA8 5616 bytes
SHA-256: d29bd6b679dd015fcf741a7dd29ab0a3ad2c63a463f6b2f9fe2f5c6b0d984ca8
font_01_sfnt_off000071b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B1 10632 bytes
SHA-256: d9c9e25055863bdca02aa9ef24f0b46a44d672aa339e8d9b371e293d7ed971b7
font_02_sfnt_off000095c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95C7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f