Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cdfd8e587ccc3f…

MALICIOUS

PDF

55.7 KB Created: 2020-08-22 06:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0e4a9b3c41de3c6411d1513e74329c8f SHA-1: d3120585506a3f2d65683b5bcf307c976ab0848c SHA-256: b1cdfd8e587ccc3f8592a68046fb6d981e9bdad87b5eef0df5813433161d9100
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru', which is designed to lure users with the keyword 'android backup service apk'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to malicious infrastructure via a deceptive link.

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=android+backup+service+apk In PDF document text
    • http://fodexa.perchancetheatre.com/uploads/1/3/1/3/131384600/a803713e2fb1d8.pdfIn PDF document text
    • http://fosari.heshooktheworld.com/uploads/1/3/0/8/130814328/6175615.pdfIn PDF document text
    • http://mowonej.cindysearles.com/uploads/1/3/1/3/131380999/ee4ebc4.pdfIn PDF document text
    • http://files.carrollcountyfarmersmarket.org/uploads/1/3/1/4/131453536/40823df9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5103/1447/files/66880026955.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5165/5061/files/neveligo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6734/9923/files/pdf_to_word_converter_app_for_pc_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5317/7237/files/cricket_rules_book_in_tamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/subevuvugup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3556/4949/files/sifopuzegitek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7592/8215/files/rawakobeduminisedaze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9774/2750/files/european_society_of_cardiology_guidelines_pregnancy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bebupikisanomagidilu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3067/3565/files/supekadunizodewef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000088a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88A1 5088 bytes
SHA-256: c5a193fa7449467837a8bf6386b7e1498c0d4e1bc721f126c0c0aff99bfa63b5
font_01_sfnt_off000099ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99EA 12792 bytes
SHA-256: 5d982b96e07315b3dca202ffc76aa196eb12a12298d185e1bcfe1e9e76ccb505
font_02_sfnt_off0000c38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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