Malicious PDF — malware analysis report

Static analysis result for SHA-256 412daec5b87d9d4f…

MALICIOUS

PDF

42.6 KB Created: 2020-08-15 12:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 166a331002bd76725b7f8cad118705cf SHA-1: f588efec0b95a9bb7a4eb1e8363db3becd1643a7 SHA-256: 412daec5b87d9d4fc12198a7e3220108d08093ac435ad4d631108863dbaa5c17
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=fred+perry+footwear+size+guide'. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or obfuscated, but the presence of the malicious redirector URL is the primary indicator of malicious intent.

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=fred+perry+footwear+size+guide
    • http://files.youtransformingyou.com/uploads/1/3/0/9/130969381/6999479.pdf
    • http://files.intotheirhearts.com/uploads/1/3/0/7/130775379/gafifinaz.pdf
    • http://files.niassestudios.com/uploads/1/3/0/8/130874318/b919e96e4ba.pdf
    • https://cdn.shopify.com/s/files/1/0434/0757/3149/files/soxesubadabezimokezeneb.pdf
    • https://cdn.shopify.com/s/files/1/0428/4124/3814/files/nimarazasifi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/nezajejuzanugusedobogazep.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/craftsman_riding_mower_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/6122/9206/files/85397023003.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vewurobafug.pdf
    • https://cdn.shopify.com/s/files/1/0435/3956/2645/files/boostrix_package_insert.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/88895315386.pdf
    • https://cdn.shopify.com/s/files/1/0437/3502/3770/files/24364097795.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4012/files/gate_2020_syllabus_ece.pdf
    • https://cdn.shopify.com/s/files/1/0440/6591/5032/files/discord_new_member_messages.pdf
    • https://cdn.shopify.com/s/files/1/0434/9440/8352/files/nasafisapafitupo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059e5.bin
dc848f8fc0591409c3359d17ddcdd9a152d46b1bdac63388edebece0a31ee71e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59E5 5152 bytes
font_01_sfnt_off00006ba8.bin
220896a150cc92e62aef61403b77649a7335c7b5aa0ac31c33a61889139953af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA8 10464 bytes
font_02_sfnt_off00008f4d.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4D 4324 bytes

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