Malicious PDF — malware analysis report

Static analysis result for SHA-256 31241e4ac356142e…

MALICIOUS

PDF

36.9 KB Created: 2020-08-22 02:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: dc5a2834fcb23c7a6e0f2d745e384129 SHA-1: 33851a0437b74836e1bb530895264520599dfdfd SHA-256: 31241e4ac356142e07331c7ebfca81a282e73a6b4429d235f67e709f96351b1b
194 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a critical redirector link to ttraff.cc. It also exhibits characteristics of a PDF link farm, embedding numerous external PDF links, with the primary malicious link pointing to a redirector. The document body contains garbled text but includes the target URL, suggesting a lure related to humidifier manuals.

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=aprilaire+automatic+humidifier+control+model+60+manual In PDF document text
    • http://files.ptkranch.com/uploads/1/3/1/6/131606965/fadezujeno.pdfIn PDF document text
    • http://files.redroostergrill.com/uploads/1/3/1/4/131406762/59e6a4578591d.pdfIn PDF document text
    • http://files.londonhouseproducts.com/uploads/1/3/2/6/132681452/timowajifoxi.pdfIn PDF document text
    • http://files.cre8connect.com/uploads/1/3/1/4/131483154/xeritatozolujoga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7193/8461/files/83853489640.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/files/nunopuvugin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5281/7832/files/derivative_calculator_using_formal_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1954/2434/files/49746807080.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/21676572071.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0808/9509/files/asme_b31._3_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3934/9146/files/31686901214.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8284/1250/files/3046987036.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2986/4343/files/essentials_of_teaching_academic_vocabulary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3145/3081/files/37107129376.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7432/1560/files/bengali_folk_song_mr_jatt.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 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5215 5500 bytes
SHA-256: fb12ac406aa812a76e125d5eb32e4367813f051b3327916fc79011eca6bcc5d7
font_01_sfnt_off0000649e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x649E 9952 bytes
SHA-256: 039de4bf046cae390bb367a2d05df9fe7bc66d040edcd3c7c5d45e4d185ba07a

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