Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7603845d0a6eec…

MALICIOUS

PDF

45.9 KB Created: 2020-08-09 04:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: bc981235699840f884a8cb5c1506b085 SHA-1: 0c71a827522b5239c65c7fa61b1dc4c6faf551f6 SHA-256: bf7603845d0a6eecce016bd57984aedb02729222e2f6bab3a56372e9f5fabff6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a high number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Casein in milk pdf' and the malicious URL, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness. 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.com/pify?keyword=casein+in+milk+pdf In PDF document text
    • http://files.vungtauhash.com/uploads/1/3/1/4/131454373/ab1782fc6b933cb.pdfIn PDF document text
    • http://files.athens-greece-taxi-tours-transfers.com/uploads/1/3/1/3/131379496/vekalejevetelukus.pdfIn PDF document text
    • http://jefixi.thebackpew.com/uploads/1/3/2/3/132303382/xarexe-jiwifasu.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/1/0430/7265/1413/files/how_to_make_gunpowder_in_little_alchemy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1643/8438/files/zogalosawunalapiroti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/2547/7277/files/guia_ceneval_exani_ii.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7950/7870/files/rolixuni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1731/3178/files/26780180267.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3838/9925/files/c_est_moi_camelot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7962/3071/files/62517536774.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8494/7357/files/78536850862.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1907/4722/files/20106772855.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigefuminif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44219577828.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2894/5815/files/revomonawirufu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4441/3341/files/29022470104.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 2

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_off00006a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A00 4776 bytes
SHA-256: 6a8fb4db0d88e24d23e8a0196e4c7f6962faf24bc944dceec464739be1499b6d
font_01_sfnt_off00007a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A1A 9992 bytes
SHA-256: 3c163ddcd9e0fc491bebce50f89561f8da37925c8b2bdd0512764489e67600c9
font_02_sfnt_off00009c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C44 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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