Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64b3cb9f371a02c…

MALICIOUS

PDF

48.3 KB Created: 2020-08-23 00:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 26d8ffc56ad79d1eed4aac4b0bb15c5b SHA-1: 4f3d732318404f45ed201d18aa0f561d5bed994a SHA-256: b64b3cb9f371a02c446f1ddd3f0b01aa4ff5554b4c14a1c4aa2e999ded2bfa1b
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'climbing guide book' and includes the malicious URL, suggesting a social engineering lure. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=wichita+mountains+climbing+guide+book In PDF document text
    • http://durow.riveflowyoga.com/uploads/1/3/1/4/131454950/buzifusalatapos-zeliwirabejepe-fepemaletotedet-gupozitoxuwep.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://cdn.shopify.com/s/files/1/0436/0149/4179/files/20487352658.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3331/9831/files/gatamewefifekewote.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/44888556167.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8897/5774/files/monthly_income_expense_sheet_excel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1978/7675/files/abby_finereader_convert_to_word_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5488/1175/files/juxujejasokejane.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/gulazeki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0334/7098/files/suzevuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8468/5224/files/33396670459.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2423/7212/files/bioenergetics_slideshare.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5936/3478/files/dinozedolara.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7094 5356 bytes
SHA-256: d4f12e332bdc9f73711931607d6dc1340ae1bff1f4b0640c3f17f0d584c12d57
font_01_sfnt_off000082ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82AD 10512 bytes
SHA-256: ce56e354898110dcca36c734fca090aed1b19b88ee13ed2084566b8ee6ff2416
font_02_sfnt_off0000a69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA69F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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