Malicious PDF — malware analysis report

Static analysis result for SHA-256 7656139b29b08c58…

MALICIOUS

PDF

51.9 KB Created: 2020-11-06 11:34:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 55a1c2e029da949c8fa29cde8d6b5800 SHA-1: 461bf71a8670e50970883674713d0ac31520a3ec SHA-256: 7656139b29b08c584890e920177fdfa1ed237d3478620cfd1c7048f3156af627
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a redirector URL. This behavior is indicative of a link farm or phishing campaign designed to drive traffic to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links supports this assessment. No scripts were extracted, but the document's structure and embedded links suggest an attempt to trick users into visiting malicious infrastructure.

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://traffmen.ru/123?keyword=st+louis+cardinals+2020+winter+warm+up In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_5fa4f8dcb5790.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/8990309.pdfIn PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/f2dd59b8995f0e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383147/normal_5f9c929f25c36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/napisakaluja/pdanet_5.21_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/98173977868.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/hp_laserjet_m1319f_mfp_fax_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/working_model_jet_engine_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/3625537214.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/pathfinder_fey_form_4.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/buddhism_vs_hinduism_afterlife.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/antioxidant_and_free_radical.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/witch_circle_elements.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/wasedixegakadunafonal.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 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD8 5572 bytes
SHA-256: 523b64f0bed1fe21c4a838fa219d98fe7f01fb17f6866652457928c6444fa98c
font_01_sfnt_off00008fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FAB 10700 bytes
SHA-256: 9704f926eedf3243f04d34003446c1b3c45b8fafcbde92e91ffab7eeb86a37a5
font_02_sfnt_off0000b41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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