Malicious PDF — malware analysis report

Static analysis result for SHA-256 271d6ea99f3e6d81…

MALICIOUS

PDF

52.4 KB Created: 2020-07-10 05:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f386138910707cd54120a811a5947ff8 SHA-1: 8568b25050af7ceb02fc30a414f22560264a4df5 SHA-256: 271d6ea99f3e6d8144232b96df7d024b5a04057f5752a263a3b91d30a2713a32
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or link farms. The document body text, while partially obfuscated, includes the URL 'https://ttraff.ru/wb?keyword=vegetarian%20sources%20of%20protein%20pdf', suggesting a lure to a malicious site. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a campaign to drive traffic to potentially harmful destinations.

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/wb?keyword=vegetarian%20sources%20of%20protein%20pdf
    • http://files.gretchenjude.com/uploads/1/3/1/3/131398075/5790187.pdf
    • http://files.valleyliberator.com/uploads/1/3/1/6/131606035/padavosagog.pdf
    • http://files.vexsens.com/uploads/1/3/0/7/130775846/waforumuwanaxogudo.pdf
    • http://files.wyomingparkumc.com/uploads/1/3/1/3/131379168/mijirem.pdf
    • http://files.restauranthibiscus.com/uploads/1/3/0/7/130776841/5106130.pdf
    • http://files.patriciagodden.com/uploads/1/3/1/4/131483019/5adf2.pdf
    • http://files.helpsaveourhistory.com/uploads/1/3/1/4/131437091/rikebajafok-dokumudezani-fusex.pdf
    • https://vabogojup.files.wordpress.com/2020/07/xomopalisapoto.pdf
    • https://zorevuz.files.wordpress.com/2020/06/daruzatojalavowab.pdf
    • https://titunejerok37025062.files.wordpress.com/2020/07/fusukibujogesopaz.pdf
    • https://lamaretuxiz.files.wordpress.com/2020/06/72393757222.pdf
    • https://vosafeviba.files.wordpress.com/2020/07/rapuwubigaxadovalugad.pdf
    • https://jetufaru.files.wordpress.com/2020/06/fesadonimubareka.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49839171509.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jedufejaselikaruratemop.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98455436519.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96328102714.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kuzizurogepibisomagin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/norojakibi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90554838216.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_off000090ba.bin
9e9139fc0a0288d170a9abcee4ec4c7a5bd70569a81680005ccb5e01ec65e6d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90BA 5136 bytes
font_01_sfnt_off0000a243.bin
1ce8dabc26734eb9bbb258b4817491af7c1a8d4f53f96418081a78504c22f348		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA243 10100 bytes

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