Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c871b8f7a8e5cab…

MALICIOUS

PDF

39.8 KB Created: 2020-08-15 05:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5e4d39d56463c849fa279a196a3084ce SHA-1: 72b484bf4371b475082a55aa239a7817b0dd02a9 SHA-256: 1c871b8f7a8e5cab6e183023d7ee9f196706810c25677775968af4135f0fdc2e
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO poisoning or redirecting users to malicious sites. One such link, 'https://ttraff.ru/wb?keyword=tree%20data%20structure%20tutorialspoint%20pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to drive traffic to this malicious infrastructure. The presence of multiple Shopify-hosted PDF links further supports the SEO link farm heuristic.

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/wb?keyword=tree%20data%20structure%20tutorialspoint%20pdf In PDF document text
    • http://files.loyaltybeyondborders.org/uploads/1/3/2/7/132712127/dowafelo.pdfIn PDF document text
    • http://files.modernbusinesstech.com/uploads/1/3/2/8/132814567/navuv.pdfIn PDF document text
    • http://pupap.homepick.us/uploads/1/3/1/0/131070872/1419695.pdfIn PDF document text
    • http://files.balanceandneurologic.com/uploads/1/3/2/6/132696465/sunujadojuwo_xivux.pdfIn PDF document text
    • http://siwesatip.totalbodyfitnessnj.com/uploads/1/3/0/8/130874163/jafesage.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/1/0431/8347/2791/files/xikazikusotesoburewi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3088/9126/files/75345765335.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2793/1029/files/xugevoxumoremalonije.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7088/9892/files/bedajam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5285/9543/files/35185805299.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0844/8919/files/vexatiwiku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/1860/5976/files/android_sdk_manager_for_windows_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8466/7287/files/paris_metro_map_with_streets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6749/8911/files/bootstrap_4_book_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/fiwarubalewebifode.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/wukomepoxufudizipu.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 5

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_off00005e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5E 5100 bytes
SHA-256: bb1a0a44d19d907daeb36b971c718b6282ae28ba404da4f39712a66b2f3436e0
font_01_sfnt_off00006fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBB 10104 bytes
SHA-256: 3c131ec0d2a0cf839b6537896cfde1b69a4d1e16a363f7f82d48d70e0a5283d8

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