Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6a66201691f70a…

MALICIOUS

PDF

45.1 KB Created: 2020-08-31 12:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 113eb32b148580a2cc295b6d2ea261a0 SHA-1: 121e0133827cb9cb18fa53e97da99a85be2848a3 SHA-256: 4b6a66201691f70a10e8d73ba182db6dbfd51bb2d914a3a90ca936b663a69ba7
152 Risk Score

Malware Insights

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

This PDF file contains a malicious redirector link disguised as a torrent download. The embedded URL 'https://ttraff.cc/wix?keyword=damn+yankees+torrent' is flagged as malicious. The document also exhibits characteristics of a link farm, with numerous embedded links to PDFs hosted on cdn.shopify.com, suggesting an attempt to obscure the malicious destination or engage in SEO manipulation. The ML classifier strongly indicated maliciousness.

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.cc/wix?keyword=damn+yankees+torrent
    • https://cdn.shopify.com/s/files/1/0460/1954/3199/files/yoga_asana_postures_and_their_benefits.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3382/files/7532560157.pdf
    • https://cdn.shopify.com/s/files/1/0433/4652/6361/files/pmp_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7576/files/quantitative_data_analysis_journal.pdf
    • https://cdn.shopify.com/s/files/1/0430/3696/7063/files/zefiwipekijotipuriva.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tulajemo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6591/8118/files/24202138263.pdf
    • https://cdn.shopify.com/s/files/1/0435/7973/6223/files/pemifuxumuwemulor.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.pdf
    • https://cdn.shopify.com/s/files/1/0438/2271/0941/files/81385144115.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/peposorutap.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/65435682332.pdf
    • https://static.usrfiles.com/ugd/b8c837_608884fc84034fe986dfb8216e21df7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_09ced3a3177e44a4996202eaafbf7633.pdf
    • https://static.usrfiles.com/ugd/105a8c_93d7bc1566b540739dac9af744b533ed.pdf
    • https://static.usrfiles.com/ugd/e4ff69_d359315ad5e74884856b36b59b0365fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2876952825b457697e95e261c323dd3.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006721.bin
860f6523e0cb7f7c38182c8629701ebea7111a05f6cc6a076c1ea28e8260088e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6721 4964 bytes
font_01_sfnt_off00007803.bin
10c92928dabbb64dbb28c62c15a57a220ab248039a359f8381f4042fe279f391		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7803 14848 bytes

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