Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a1ec831910c851…

MALICIOUS

PDF

59.9 KB Created: 2020-08-08 21:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 469bbc571a00d903a8c24c338a72aaf9 SHA-1: 90ce535c3fbce48f7a5e140486d6f2a29bf1775f SHA-256: 39a1ec831910c851aef94099e476a7e2c943debe0bee97a7cf4aeec209dd979d
194 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The primary malicious URL is https://ttraff.com/pify?keyword=complexity+of+all+searching+and+sorting+algorithms+pdf, which is likely intended to lead to further malicious content or phishing pages. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a tactic to increase visibility or 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.com/pify?keyword=complexity+of+all+searching+and+sorting+algorithms+pdf In PDF document text
    • http://files.ashleydelapp.com/uploads/1/3/0/7/130738512/modujatobumixutepale.pdfIn PDF document text
    • http://files.karmaindiatravel.com/uploads/1/3/0/7/130739919/640d942e8f1108.pdfIn PDF document text
    • http://files.saradavisart.com/uploads/1/3/2/7/132710726/tiduxegumi_tateneloso_jegikaju_xidukulefawe.pdfIn PDF document text
    • http://files.paullentzauthor.com/uploads/1/3/0/7/130775286/miwuzulapowika-fetogubexu-xonepi.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/1/0431/9805/4558/files/7747323755.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9568/7317/files/42849543289.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/transfer_thunderbird_to_new_computer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/54700132767.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3084/6363/files/69_chevy_pick_up.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3545/9738/files/nefata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3426/3199/files/mikeziwegulopovabesofafab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5327/7603/files/biruxatuwosi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6781/0726/files/borutadukamip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9956/2911/files/29877646242.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8128/5286/files/49543045697.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8257/8088/files/blackfathom_villainy_horde.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3501/7895/files/7207682712.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000091f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91F3 5548 bytes
SHA-256: 5635f9ba610d47d61eb8e8a345156eb013ac2531376b066c12975359b66034f1
font_01_sfnt_off0000a4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4B6 14828 bytes
SHA-256: 29df0c8476aabf4bc856cce51e246aaeacbaea996a241de3016e533bd7557c1b
font_02_sfnt_off0000d399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD399 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176