Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a81bfa3c70dc7d9…

MALICIOUS

PDF

42.8 KB Created: 2020-07-31 13:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d26958950dd89d2c14df987d754256d7 SHA-1: 20e6fa94d3a318a819a010f3ae3c811a8941c0fb SHA-256: 4a81bfa3c70dc7d93b5ec95da578b5b207c93d404921c876942f68c2b1ca373c
194 Risk Score

Malware Insights

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

The PDF contains multiple links to a redirector service (ttraff.com) which is flagged as malicious. It also hosts a large number of other PDF files, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains keywords related to the links, indicating a lure to disguise the malicious intent. No scripts were extracted, but the presence of malicious redirector links strongly suggests a phishing or malware distribution attempt.

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=twinkle+twinkle+little+star+lyrics+pdf In PDF document text
    • http://files.collegesite.com/uploads/1/3/2/6/132681954/sagipadagovo.pdfIn PDF document text
    • http://files.travelingsauna.com/uploads/1/3/0/8/130813357/zowug_xonobatisobarov.pdfIn PDF document text
    • http://files.devcaribe.com/uploads/1/3/2/6/132681560/xezutuk_mitafatevej_garodudopaboja_pajepepoziwer.pdfIn PDF document text
    • http://files.companionsofchrist.org/uploads/1/3/0/9/130969375/3234800.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/1/0430/3273/9989/files/bidopiroxekapivi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8986/3580/files/98438965733.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8488/1824/files/79288618312.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84407481133.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97697777452.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/xenuwojiwulunowitusasiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8561/0654/files/sogeze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4393/6673/files/44349660571.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1553/6793/files/39301416066.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/ropizemoxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5063/1319/files/87360258810.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_off00006ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB8 5036 bytes
SHA-256: 7273c0920923df74129f39c372ac0e539218ab57da40f634ffd8d16c2ac94dcb
font_01_sfnt_off00007bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF4 9912 bytes
SHA-256: e7b8d041f2a3a9940babd7a352155988f091da6fd7c8e36ac42c0da0dd4d51f3

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