Malicious PDF — malware analysis report

Static analysis result for SHA-256 42400c4a8f1ec74b…

MALICIOUS

PDF

42.3 KB Created: 2020-08-12 21:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 76b870adb305b25c372a186b06c9ee4c SHA-1: d9cba5a6c734c5c1fc2846c0175dc62d32c19e9c SHA-256: 42400c4a8f1ec74b6d8df53a041ec0c6f8ff3c700bd1523fcc5d0c17e6d385d4
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 are SEO-optimized lures pointing to PDF files. One of these links, 'https://ttraff.ru/pify?keyword=parts+of+air+conditioner+and+their+functions+pdf', is identified as a malicious redirector. The document body itself is heavily obfuscated but contains references to the same URL, suggesting a coordinated effort to lure users to malicious content through a link farm.

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.ru/pify?keyword=parts+of+air+conditioner+and+their+functions+pdf In PDF document text
    • http://files.autumntheodorephotography.com/uploads/1/3/1/4/131454482/d2de4ab1010325a.pdfIn PDF document text
    • http://files.hawaiihomeschoolnetwork.com/uploads/1/3/0/9/130970022/1070594.pdfIn PDF document text
    • http://selemuser.bethanyproperhoa.com/uploads/1/3/0/7/130776485/wajukarogod.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/1/0434/0508/2780/files/gifij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/14162286987.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8770/6774/files/79352975082.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/38304013197.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0951/5413/files/74967608029.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8373/3915/files/guvolatoxapumabalozoxoje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0695/9514/files/kivonez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5512/8477/files/senesukeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0217/4374/files/abide_in_christ_by_andrew_murray.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0399/2485/files/castes_et_races.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_off00006885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6885 5212 bytes
SHA-256: f3ae676184400e4d43a59abf82f29c26c5c6290ce6ac3459063e6aa8b2829fa3
font_01_sfnt_off00007a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A30 9920 bytes
SHA-256: b621cd8781de727ef8463129fe2303c491f0833aaf249f1238d5cd7508fbfd5e

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