Malicious PDF — malware analysis report

Static analysis result for SHA-256 db31c5505ec237e6…

MALICIOUS

PDF

53.8 KB Created: 2020-08-03 23:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 94faa72e74fb73e54d71aed0bcb15571 SHA-1: b78c05598a4d30b2530cf7c68481cd850f39987a SHA-256: db31c5505ec237e667ece8ce1eb7be6d63b5ae9bff3462bbb5512391b31d3e24
194 Risk Score

Malware Insights

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

The PDF file contains a mass external link farm, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.cc/pify?keyword=ielts+speaking+and+writing+corner+pdf, which is likely used to redirect users to further malicious content. The document body, though heavily obfuscated, contains references to IELTS study materials, suggesting a lure to entice users to click the malicious link.

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=ielts+speaking+and+writing+corner+pdf In PDF document text
    • http://files.thekindnesscouture.com/uploads/1/3/0/8/130813511/6316595.pdfIn PDF document text
    • http://files.stephaniehays.com/uploads/1/3/1/3/131380845/923376.pdfIn PDF document text
    • http://files.bechinatown.org/uploads/1/3/1/0/131070457/4362116.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/1/0431/6368/0929/files/24766862114.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8283/2280/files/puwekezitufemibuko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/13069159718.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/16411454109.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8660/0609/files/81268687033.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6467/8807/files/liripomekamunugopamexa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/lejusirubafuvodidis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2236/0469/files/setting_up_a_web_server.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/car_body_repair_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1460/0342/files/liwovulameri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/93881029638.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/bulomobaw.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 1

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_off000094a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94A9 5416 bytes
SHA-256: dc0277c41da445aaf854470556474d95d59057068a5f3263a3fa15b8ca9e998d
font_01_sfnt_off0000a73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA73C 10528 bytes
SHA-256: f1ac5d207a86d3bef106a0475cadf131e90943eb1ecde0825325f6c6236a9e4a

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