Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f745cf02e6c7c50…

MALICIOUS

PDF

43.6 KB Created: 2020-08-24 21:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f370cbff5e25672cdb958e699c6015df SHA-1: 8b2f45762cd324fd2e776d08c1f826c844ab2ab1 SHA-256: 4f745cf02e6c7c50456e7b3f0decc3f3904ae4f8b700d2f69a26e19bbec553dd
234 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to what appears to be a link farm designed to mimic search results for technical topics. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc', which is used to obscure the final destination. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=android+architecture+components+github+example In PDF document text
    • http://files.ballersabroad.com/uploads/1/3/2/7/132740852/xoluf.pdfIn PDF document text
    • http://files.afrocubanforum.org/uploads/1/3/1/6/131636602/jijotebiw.pdfIn PDF document text
    • http://vodudev.waxcustomjewelrystorepittsburgh.com/uploads/1/3/0/7/130775405/2acdf43d0.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/1/0429/8866/7034/files/buffettology_workbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5774/0957/files/renewable_energy_technologies_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9846/2624/files/47854052732.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4854/1079/files/75756405324.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1217/7572/files/8553507073.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/10382179962.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/63047004652.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 3

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_off00005b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B98 5564 bytes
SHA-256: c7fe0ddf2acd8206dbe7aef47c4e2241f623b60c42b2bd9cbc7edae4c63cb7b9
font_01_sfnt_off00006e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E46 10948 bytes
SHA-256: adaa6d5858467a9edf586f221204b5091e8bc2fa1535ef9b057fdfc5468cf64c
font_02_sfnt_off000093a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93A0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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