Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a740d46f205cede…

MALICIOUS

PDF

45.0 KB Created: 2020-08-11 22:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccaf3dfb4834adff14a8e4bf83aeb5d4 SHA-1: 7b8c992ddd6ce0e20a278ce47faa91aeba8a58c9 SHA-256: 0a740d46f205cede1aab1733d8bb263e64252addd95d0a6a9980f19f2e46b3fe
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to what appears to be a link farm designed to mimic legitimate content, such as 'bootstrap 4 cheat sheet pdf download'. One of these links, https://ttraff.ru/pify?keyword=bootstrap+4+cheat+sheet+pdf+download, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains the malicious URL, suggesting an attempt to disguise the 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=bootstrap+4+cheat+sheet+pdf+download
    • http://dudidubev.catherine-cooks.com/uploads/1/3/0/7/130740596/5f092efdaf42d0.pdf
    • http://files.anthonymichaelscatering.com/uploads/1/3/1/0/131069992/sibufo-gobiz-mebomebuwamil-gopena.pdf
    • http://kugisamot.rooftopmissions.com/uploads/1/3/2/8/132814930/4607180.pdf
    • http://files.cheyennebrubacherphotography.com/uploads/1/3/2/3/132303013/0c21d7751b4f5.pdf
    • http://wegoti.laptopdatabase.com/uploads/1/3/0/8/130874633/mibozimar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8587/9713/files/44781835579.pdf
    • https://cdn.shopify.com/s/files/1/0435/7426/3963/files/fobubitaxidisu.pdf
    • https://cdn.shopify.com/s/files/1/0445/8446/8644/files/psychological_testing_and_assessment_cohen_summary.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6439/files/air_pollution_control.pdf
    • https://cdn.shopify.com/s/files/1/0434/9090/2166/files/96479719499.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8515/files/puradefovotut.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7535/files/free_online_car_repair_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/rogimewememolivuxodasewo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81236671698.pdf
    • https://cdn.shopify.com/s/files/1/0435/4641/1162/files/captivity_of_negativity.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1510/files/arteriografia_femoral.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/91128079496.pdf
    • https://cdn.shopify.com/s/files/1/0437/1713/2456/files/19785080549.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_off00007316.bin
454315d1b434cdb3c32a07eb34c1c1c81f93c9f61b555b015b168b9b780f8d3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7316 5472 bytes
font_01_sfnt_off000085c3.bin
0768421c67bc55fb0795c65e9dab591e9c722d57129880b9cabb5cdbd2af5afa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85C3 9552 bytes

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