Malicious PDF — malware analysis report

Static analysis result for SHA-256 658d3f72d3e6e399…

MALICIOUS

PDF

44.1 KB Created: 2020-08-13 22:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abdb8d3f919361f738863a6a2ee6130f SHA-1: a16949ae53039c83acb86b031da50317cc1c5fce SHA-256: 658d3f72d3e6e399f58a801fe3470edf24fc8a33793c7f9f447497d12954ee40
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify and a known malicious redirector. The primary malicious URL identified is https://ttraff.ru/wb?keyword=merge%20jpg%20to%20pdf%20free%20software, which is likely used to redirect users to further malicious content. The document body, though heavily obfuscated, also contains references to this URL and other benign-looking Shopify links, suggesting a lure for users seeking free software.

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=merge%20jpg%20to%20pdf%20free%20software
    • http://files.nicholasphilliou.com/uploads/1/3/0/7/130775286/e5509f20.pdf
    • http://files.muringavila.com/uploads/1/3/0/8/130813536/zidevozovis-vutaxinuf-fizer-mowik.pdf
    • http://pesig.shop.dannysrods.com/uploads/1/3/2/3/132302780/33a7f2b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65022979336.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/33671646444.pdf
    • https://cdn.shopify.com/s/files/1/0440/1859/8038/files/vitonabinukizigepuxoju.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/91867005904.pdf
    • https://cdn.shopify.com/s/files/1/0430/4112/8601/files/zusogawupipojumobekivo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3256/7195/files/razesekiv.pdf
    • https://cdn.shopify.com/s/files/1/0454/7464/4120/files/anemia_normocitica_normocromica_en_perros.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/deved.pdf
    • https://cdn.shopify.com/s/files/1/0428/1470/1735/files/91810352865.pdf
    • https://cdn.shopify.com/s/files/1/0430/6737/5777/files/vuvejuwagajapaxirakogepi.pdf
    • https://cdn.shopify.com/s/files/1/0445/8243/7028/files/ashrae_fundamentals_handbook_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060c3.bin
02e2c03f6b76d228508c65ba0e1eaaa484d50c6ef91baf2aac0dfaf7fa3e0c29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C3 4984 bytes
font_01_sfnt_off000071ed.bin
fcc6acf1b9ee86a56e31912edf9d7a7802f9c64b7fdf9dbf4e75549f2f309034		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71ED 10364 bytes
font_02_sfnt_off00009578.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9578 4324 bytes

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