Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c328340e721a66d…

MALICIOUS

PDF

48.0 KB Created: 2020-08-02 21:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c10645cdd7e4712729aaed17b7d75058 SHA-1: 717364ea91c265b66d68f47b902a9d681d33958d SHA-256: 8c328340e721a66d70df887b4ceb78622af899bbb84f837848271e3b99ae6d6c
194 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. One critical heuristic firing indicates a direct link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=windows+10+hardening+script'. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirection via the embedded links.

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=windows+10+hardening+script In PDF document text
    • http://files.bahamasteachercadets.com/uploads/1/3/2/8/132814097/wotawudo.pdfIn PDF document text
    • http://files.limegreenconsulting.co.uk/uploads/1/3/0/7/130738512/330897.pdfIn PDF document text
    • http://files.lawlerpubliclibrary.com/uploads/1/3/1/1/131163980/mefuwivebaj.pdfIn PDF document text
    • http://files.theirmadiaries.com/uploads/1/3/0/7/130738996/vodezagij.pdfIn PDF document text
    • http://files.paveshare.org/uploads/1/3/2/6/132682883/rokumi.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/1/0436/4215/9257/files/21325053063.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5312/8612/files/sewora.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30553092986.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/67889106277.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4794/3330/files/budemilelufutivudo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/xapajavakizo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/grade_3_shroud_topsoil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2746/2301/files/r_mtg_arena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/1323/2024/files/serial_ccleaner_professional_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2562/8327/files/63024833633.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9881/6150/files/80693647531.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23631451812.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0913/8075/files/ponukebikumumazezisot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/secret_lovers_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/nulojugugoxafid.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: bahamasteachercadets.com 3 samples

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B04 5600 bytes
SHA-256: c7ddf4844f727cf3ec61109d97b2a73d3c02cfdce39364aba8532045ecb3a097
font_01_sfnt_off00008e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E30 10600 bytes
SHA-256: 855d02b135a6b7180edebb6a590f042eed9c7f867a7792f5a70adcaf5272e7f6