Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8dd0435a9b5b1e…

MALICIOUS

PDF

41.6 KB Created: 2020-08-06 08:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 76c7cc78988e79372946ff7d62143614 SHA-1: b9f484e01e0e5a55174bb6b21bf089c848f317be SHA-256: 5b8dd0435a9b5b1e62bd3b587402428b84d1ec893c97bb3da3394a2fcf6fd433
194 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, includes URLs that appear to be part of an SEO link farm designed to lure users into downloading potentially malicious files. The ML classifier also strongly indicated maliciousness.

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=altiplano+mexicano+pdf In PDF document text
    • http://files.figman.com/uploads/1/3/1/1/131164016/lubowozuku.pdfIn PDF document text
    • http://files.thinkinenglish.org/uploads/1/3/1/4/131406811/kifivegipifalas-sesanefafu.pdfIn PDF document text
    • http://files.suabhyankar.com/uploads/1/3/0/7/130740514/9016030.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/1/0429/8450/5498/files/arabic_calligraphy_art.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/35601959130.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9875/7538/files/sovorosexonasepu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8862/5302/files/gujefesexewapu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/soxevebusutiviladefa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5372/7394/files/77417100930.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0407/5933/files/vawinilojudaruvetudireva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55079075607.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4542/9160/files/tutumo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/napufodux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/73520422928.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/fibonacci_sequence_formula.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: thinkinenglish.org 3 samples

Related samples 4

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_off00006334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6334 5084 bytes
SHA-256: be733f79aab90e5dc34d29ec03204d9fabdd344bd80da9a817ae1cef9be71af7
font_01_sfnt_off00007478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7478 10996 bytes
SHA-256: 0c854ca5b746dcba3ff1cfd47a93a3ac2728014ddaff1513a0bf4563a364360b

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