Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef486ea0625d1796…

MALICIOUS

PDF

43.5 KB Created: 2020-08-24 03:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a21af3aa4b6c5a4cbb779f221dac19d3 SHA-1: a501e9db4cb75ed84f11bdbb66e19740a7f09fc3 SHA-256: ef486ea0625d17962bfcf272107600af027de831ac46fa29ba8d4652790c6592
162 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=chinese+chess++free+pc', is designed to lure users with the promise of free PC games. The PDF also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm for SEO manipulation or to host further malicious content. The ML classifier strongly flagged this PDF as malicious.

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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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.cc/pify?keyword=chinese+chess++free+pc In PDF document text
    • http://files.shcdesignsllc.com/uploads/1/3/2/7/132740488/bofobiraje_pusufejusuvewor_sejugef_sokolej.pdfIn PDF document text
    • http://files.ayalalandalviera.com/uploads/1/3/2/6/132681985/533e0261a59.pdfIn PDF document text
    • http://kizipa.jacobsden.co.uk/uploads/1/3/1/1/131164229/6913500.pdfIn PDF document text
    • http://nesez.opt-hires.com/uploads/1/3/1/6/131637016/3664243.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/1/0437/5432/4117/files/8759290738.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2356/4957/files/lowes_lavale_md.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6237/8152/files/48034575435.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/adj_mega_hex_par_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7205/2643/files/64787416671.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6487/6444/files/regulatory_reporting_accountant_resume.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8117/9048/files/17146235802.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2638/0960/files/wamuvo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4691/9579/files/comment_combiner_plusieurs_en_un_seul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/google_docs_newsletter_templates_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7410/1149/files/zafeni.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 6

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_off00006d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D96 4764 bytes
SHA-256: ca9ddf8382502a29f750df22c7750327f71f4e55e8bfb21af412f8c94e8bd7bb
font_01_sfnt_off00007dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC0 10436 bytes
SHA-256: 8f8fb7a57db3e0a49a33f50f8a0b6445334c273bfde7e3e6ed7d0dbdb39f9548

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