Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ba0df4c299a3a4…

MALICIOUS

PDF

32.7 KB Created: 2020-08-26 08:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5b3531cd0fc36bd44d6f00bcb1fc4315 SHA-1: 13e27911e52981d595354178d4bb954befbd0fde SHA-256: 82ba0df4c299a3a45eff951de282388ae3f00c7b78e94172bfdbb5fbc7bfd00c
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, identified as a redirector for SEO-based phishing. The document body, though heavily obfuscated, contains text related to grammar exercises and the malicious URL itself. The ML classifier strongly indicated maliciousness, and the PDF structure includes multiple external links, suggesting a link farm or redirection tactic.

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=english+grammar+multiple+choice+exercises In PDF document text
    • http://files.barriointellect.com/uploads/1/3/2/7/132740321/104c7d.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/1/0433/6248/4392/files/17573925283.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4047/2214/files/vuzepugakodofuwibaputobap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4115/1386/files/direct_speech_worksheet_grade_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7810/7811/files/historia_del_abencerraje_y_la_hermosa_jarifa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5794/6522/files/75761810697.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/86573188552.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4225/9612/files/tifejaziluzezo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7310/1214/files/kaxexelojabatogajazomu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7573/1607/files/45687144.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/52690086480.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_off0000410c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x410C 5372 bytes
SHA-256: 086a2dbc8ff0a9fc45155e2896c83cc3d067e2226dd1e79e2364d8ae8b6694dd
font_01_sfnt_off00005328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5328 9756 bytes
SHA-256: bc5c41ad9b10f1a02a7ad0b051da2f22a835da4506a7d2519a5f201d367cd0a3

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