Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf723c696fa3d73…

MALICIOUS

PDF

44.6 KB Created: 2020-08-06 05:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3e17f521c656c48dfd12c2cb7c71f0e2 SHA-1: 485d6a3ff7d2ff94460cb03fa3fadf9d884cc109 SHA-256: bcf723c696fa3d73bf6c74bb6d62a0bed55dfdd49a4987e4ac6d5e8b542ef9e9
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is used to obscure the final destination. The document body, though heavily obfuscated, contains the URL that triggers the redirector. This suggests a phishing or malware distribution attempt leveraging a link farm to bypass defenses and potentially distribute malicious payloads.

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=casey+at+the+bat+questions+pdf In PDF document text
    • http://files.cogzlife.com/uploads/1/3/1/4/131409090/fixexerarovaf-menowuro.pdfIn PDF document text
    • http://files.scogbahn.co.uk/uploads/1/3/2/6/132696113/nimulidiguve_lulevufenavotof_berufupuduxirok_vurezijavizazew.pdfIn PDF document text
    • http://files.roscoeforbart.org/uploads/1/3/2/7/132712383/6838326.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/1/0433/1647/8110/files/miwidulerazora.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/encyclopedia_of_life_support_systems_eolss.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6489/3344/files/53716249404.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/afro_cirkus_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3092/0871/files/jadus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9291/7924/files/3444570151.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/asrock_a-_tuning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2933/0082/files/betemujapedubigotu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34007074416.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_off00006231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6231 5276 bytes
SHA-256: e233106fbdc46d3e3c159af7a8e29ce0875cff6745bef03a931315a60d023ded
font_01_sfnt_off00007414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7414 10480 bytes
SHA-256: f30d259fa32cc93f725fa10a286c4b14757136749197aa0b0fdbe0384e31f292
font_02_sfnt_off000097a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97A0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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