Malicious PDF — malware analysis report

Static analysis result for SHA-256 559ec90c38f9c091…

MALICIOUS

PDF

58.8 KB Created: 2020-08-15 01:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 66540f340280243b099af37177f81672 SHA-1: c93d3c0efa12cb8744c41a2904d73224f9ce4436 SHA-256: 559ec90c38f9c0919e5e0b62f159e2c46c3acbc169cc7b309ef6496e909ceae5
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=recommendation+letter+template+for+coworker`. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to trick the user into clicking the malicious link. The presence of numerous links to external PDFs indicates a potential for credential harvesting or further malware delivery.

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.cc/pify?keyword=recommendation+letter+template+for+coworker In PDF document text
    • http://kufat.baldwinobryan.com/uploads/1/3/2/6/132696021/7df025.pdfIn PDF document text
    • http://files.chasenigleheart.com/uploads/1/3/0/8/130874633/nugideti_kavibapupad_juwumotitoxiv.pdfIn PDF document text
    • http://files.klayworks.com/uploads/1/3/1/4/131437087/damew.pdfIn PDF document text
    • http://files.nguyenphuchoc199.com/uploads/1/3/1/1/131164076/masagusepapagigap.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/1/0428/6123/2294/files/taittiriya_aranyaka_telugu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4452/8550/files/business_model_generation_wiley_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/xinevojarixaxabojupebesod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1734/6982/files/the_handbook_of_bilingualism_and_multilingualism.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/86222763117.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8674/0646/files/mean_median_mode_formula_statistics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/megejazofabalitisowomepev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4646/1855/files/lonely_planet_paris.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/44855609391.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7BD 5288 bytes
SHA-256: 2bf463857d7c01c25ef00fe381f15bab1ac87d2b2025edb34881648bc8d1c758
font_01_sfnt_off0000b9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AB 10696 bytes
SHA-256: d98a54971541c7e57ce5d3cd92bd3c91728d902440695dac765ce119667c037c

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