Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64c01f1b8ce9ac0…

MALICIOUS

PDF

45.4 KB Created: 2020-07-31 12:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 99885cdda55fae7b2e46ca812acaf2c8 SHA-1: e5c1118562392c5d8d77f37a6276869c8c78fbbc SHA-256: a64c01f1b8ce9ac0e0651d7fcb3e39f08431cd931b789cda5f903384771669bc
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. One critical heuristic firing indicates a direct link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Cornell critical thinking test', likely a lure to entice users to click the malicious links. 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.com/pify?keyword=cornell+critical+thinking+test+level+x+pdf In PDF document text
    • http://files.allfloorsinteriors.com/uploads/1/3/0/9/130969375/kexajize.pdfIn PDF document text
    • http://files.redmondacademy.org/uploads/1/3/0/7/130739802/zosig-duguritezuzamuk-mexutula.pdfIn PDF document text
    • http://files.redeemwithgod.org/uploads/1/3/1/0/131070911/jomolagofon_bufalemo_jaber_nujukimalijoz.pdfIn PDF document text
    • http://files.fernando-guimaraes.com/uploads/1/3/2/6/132695915/piwelowor.pdfIn PDF document text
    • http://files.hobblevhorses.com/uploads/1/3/0/7/130739298/vekutinekerudi.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/1/0432/9819/3566/files/75419825110.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4369/2445/files/xevepadujinewafemogoninag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8201/5129/files/vemojuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90067119925.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4681/4374/files/31078288196.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6105/9477/files/65837514096.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7578/7162/files/filovutipubesazudipe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1620/8036/files/kepowoxatopikefizi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5651/2680/files/49638758847.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/15193003951.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0393/5902/files/60771005083.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000720e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x720E 5420 bytes
SHA-256: a67bd24895ee9cac48d8ed6d3760753b0bc069547dade47143fc246ecdef121e
font_01_sfnt_off00008474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8474 10348 bytes
SHA-256: 4821f3f4dde3f4fbc8c41240d252684ab5240fb86fc714f19115424cdfbcf0c9

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