Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81c764ed38ce5cf…

MALICIOUS

PDF

38.2 KB Created: 2020-08-12 20:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3fbd690307cabe9393b57278a75929a3 SHA-1: b1d7ec6e4a0ccd96eaba8c772a2b9dbeda274aec SHA-256: e81c764ed38ce5cf60d5cb61a6a1ed35c924eee6c83e871f4303bc2b12cdfde5
194 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=past+tense+affirmative+negative+interrogative+exercises+pdf'. The document body, though heavily obfuscated, appears to contain this URL and other links, suggesting a lure to external malicious content. The presence of a PDF link farm heuristic further supports the malicious intent of distributing links to potentially harmful content.

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=past+tense+affirmative+negative+interrogative+exercises+pdf In PDF document text
    • http://files.hetzlerart.com/uploads/1/3/2/6/132695867/dizobu.pdfIn PDF document text
    • http://files.unfoldingdivinity.com/uploads/1/3/0/7/130740323/bd716eeb5aed9d4.pdfIn PDF document text
    • http://files.fredkaplanbiographer.com/uploads/1/3/1/3/131380107/8174254.pdfIn PDF document text
    • http://files.jessicatcohen.com/uploads/1/3/2/7/132740405/0ca87c393ca0e71.pdfIn PDF document text
    • http://zidexafo.tarnaturals.com/uploads/1/3/0/8/130813612/liwurasupitaxi-padozinule.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/1/0452/6043/9713/files/statistical_analysis_tools.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7631/2478/files/gofad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/51866380087.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4634/6658/files/17088711717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2040/3356/files/boxuwabojes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/2528554621.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8930/4477/files/fasowigududugugixares.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6710/4664/files/rimaturejex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7641/9744/files/piporuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/fetalaku.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
🗂 Part of campaign: fredkaplanbiographer.com 3 samples

Related samples 6

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_off00005485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5485 5572 bytes
SHA-256: b694051352052a26bf3d5637fa7937095c49351ae191ace266d58bda2c4c8012
font_01_sfnt_off0000675f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x675F 10760 bytes
SHA-256: 096d421d47bd89624f74b2a4f43906900fe04de746b619108cb8cd4318f463b0

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