Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a821917e9bd8a7…

MALICIOUS

PDF

38.5 KB Created: 2020-08-15 01:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 59fa531c50ec8c1035b2a3c782187bc0 SHA-1: 15aeb5c80937d70f51e17d7e78ebe524a3b55908 SHA-256: 51a821917e9bd8a7fc7416d8268b6b4b62da029b69d617be912d00ab811a8e57
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=bs.+to+app+apk'. This suggests the document's primary purpose is to drive users to malicious sites. The presence of numerous Shopify-hosted PDF files indicates a link farm strategy, likely for SEO poisoning or distributing further malicious content. No scripts were extracted from this sample.

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=bs.+to+app+apk In PDF document text
    • http://xojezolok.nasreenweldencounseling.com/uploads/1/3/2/7/132741555/5640812.pdfIn PDF document text
    • http://files.heykennarae.com/uploads/1/3/1/4/131407388/pidononivi_zumosevuxusut.pdfIn PDF document text
    • http://files.marimbahall.com/uploads/1/3/1/3/131398477/117ec6dc2365.pdfIn PDF document text
    • http://files.trimleystmartinprimaryschool.com/uploads/1/3/1/3/131378950/9349767.pdfIn PDF document text
    • http://files.simplecinemareviews.com/uploads/1/3/1/3/131379894/gupilosis-mixapugaj.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/1/0428/1230/9671/files/bavegofupofonojovadiwu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1982/8386/files/10302599163.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4247/1064/files/rimomulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8043/4342/files/mirafipomupifavevej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/pusesotobip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7664/0156/files/blackjack_python_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/bulojosovave.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/49109197216.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3174/6967/files/template_powerpoint_modern_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/6845/1992/files/email_extractor_from.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/loctite_242_datasheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/lonedosidexiza.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_off00005af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF1 4828 bytes
SHA-256: 9b172736ac6f320b8f5d97fa51c0a3582bf5806ee1c47c9bafd0f2d704cc66ea
font_01_sfnt_off00006b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7A 9904 bytes
SHA-256: 1b1a84ec1082aa373b5e21e4f56545cf0480c6cf51fc2dfd65d5badffeef8445

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