Malicious PDF — malware analysis report

Static analysis result for SHA-256 31faec138a606ef7…

MALICIOUS

PDF

41.6 KB Created: 2020-08-03 12:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fe0c88a1028ebc838daf5d6df770ebec SHA-1: 8d444be8cb7a2da285b08c29d5a7ebd91eb2a425 SHA-256: 31faec138a606ef7c7a0027b3db443c6d7307e2d9c11443d54a6e9002e12e561
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The document body text, though obfuscated, mentions 'Kindle like pdf reader android', suggesting a lure. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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=kindle+like+pdf+reader+android In PDF document text
    • http://tupusu.eaglehavenwinery.com/uploads/1/3/0/8/130874431/jojonipigof.pdfIn PDF document text
    • http://files.sp-arms.com/uploads/1/3/0/7/130776073/1dae08f5004.pdfIn PDF document text
    • http://files.kincardinecheetahs.ca/uploads/1/3/1/4/131413718/ronagimiko_ledoronamevodox_tisofasolimar.pdfIn PDF document text
    • http://files.jjsalvator.com/uploads/1/3/0/7/130775098/6215905.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/1/0431/9959/4656/files/waxunukebawowimovefan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5384/0534/files/govuxutulaguje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7848/3097/files/dolarosologaxixizabuku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1502/0448/files/bb_gun_targets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0179/1132/files/linisufenojikok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8062/3015/files/73986010472.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7233/1675/files/fikusexotejubipib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6455/5680/files/3294409563.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5369/5647/files/83564416498.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0180/6997/files/70518950989.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9218/9089/files/tawigikejidatugejik.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 6

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_off00006603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6603 4888 bytes
SHA-256: 7b8ef42539a03ce4a4f3c3a44390e20127b4eb518698d01d6f7d8ef64739599f
font_01_sfnt_off000076af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76AF 10284 bytes
SHA-256: f1a609dfde93a4274c9c8b83307e9ea9a046710bc5d7d8ae34f4307c5b368727

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