Malicious PDF — malware analysis report

Static analysis result for SHA-256 4975bb640e10ca14…

MALICIOUS

PDF

45.4 KB Created: 2020-08-18 13:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1059a083c9ef1f7545526fc8743cdfde SHA-1: c693d64eb761dad699b6d56beace969445aaae81 SHA-256: 4975bb640e10ca144d36afe68ba201a34adf1bf9e22081ccdb28862155026094
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as search engine results, with a primary malicious redirector URL. The document body, though heavily obfuscated, contains text related to 'car racing game free for android' and the malicious URL, suggesting a lure to download or access a malicious payload. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous embedded URLs pointing to a redirector supports this assessment.

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=car+racing+game++free+for+android
    • http://pilari.victoriaminks.com/uploads/1/3/0/9/130969204/8337d2a0aaa9d.pdf
    • https://cdn.shopify.com/s/files/1/0437/6975/7850/files/gozakefisivu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8709/4177/files/dilogotomirunowasa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/32562192451.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0935/files/71262720080.pdf
    • https://cdn.shopify.com/s/files/1/0437/7303/4657/files/72386318134.pdf
    • https://cdn.shopify.com/s/files/1/0437/7359/1703/files/xewan.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/babel_plugin_transform_decorators_legacy.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8041/files/hiit_weight_training_program.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/faxirojemube.pdf
    • https://cdn.shopify.com/s/files/1/0428/8839/6959/files/koranarenurutivosajop.pdf
    • https://cdn.shopify.com/s/files/1/0440/3462/1590/files/23729681106.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_off000074aa.bin
d9d4b17df3de879a97a56e60f6b060821a41b6bc3caf20968cacb1add3e3ef98
pdf-font-stream PDF embedded font (sfnt) at offset 0x74AA 5036 bytes
font_01_sfnt_off000085b4.bin
8c0d8b49482a5da942eaf05a9142de941aad44865112305276ede684578da83a
pdf-font-stream PDF embedded font (sfnt) at offset 0x85B4 10340 bytes