Malicious PDF — malware analysis report

Static analysis result for SHA-256 140bea181644dd7e…

MALICIOUS

PDF

55.0 KB Created: 2020-08-22 00:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e067e5780eb7dd96aafc8c2296597f5 SHA-1: 568c1b66b55a91df4e38c6cdaa6b194c80b82666 SHA-256: 140bea181644dd7e36efd8b9929d59fa05c465e1ba0f225cb3341e56ba2f1e4f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=how+gallbladder+stones+are+formed'. The document body, though heavily obfuscated, contains text related to gallbladder stones and the malicious URL, indicating a lure to redirect users to a potentially harmful site. No scripts were extracted, but the presence of malicious redirector links and the link farm structure strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=how+gallbladder+stones+are+formed
    • http://files.wayjayjetwas.com/uploads/1/3/0/9/130969993/pesubati-bawovizowot-melomifenopal-befutunepurek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2485/0842/files/94313234445.pdf
    • https://cdn.shopify.com/s/files/1/0428/7479/8247/files/38127723341.pdf
    • https://cdn.shopify.com/s/files/1/0433/6133/7494/files/29422925577.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/redukenedobitaguwowok.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0657/files/excel_subtract_time.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5377/files/pantara_dirt_bike.pdf
    • https://cdn.shopify.com/s/files/1/0430/1488/1433/files/amadeus_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/4705/7568/files/carol_of_the_bells_libera.pdf
    • https://cdn.shopify.com/s/files/1/0429/2512/9894/files/15990169937.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/53021109575.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9309/files/39577533640.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5006/files/sha_algorithm_in_cryptography.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rimudunibodosugesujusuvud.pdf
    • https://cdn.shopify.com/s/files/1/0436/6503/1321/files/96626232742.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000096bd.bin
d2bc1d5b8a850d69fdd8c020490af548350074f28f7d38f30501c9ac083f0ee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96BD 5420 bytes
font_01_sfnt_off0000a91c.bin
dd093c4295aaa12c9628eeca792e9bf5b2332076bcc540dab0f942dfc410b8bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA91C 10936 bytes

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