Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e7ea31ab6b7e0a…

MALICIOUS

PDF

63.2 KB Created: 2020-08-11 20:39:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf00ee30efb9d290122b4ec1734f64bf SHA-1: cc99bc7d47feba959316f6187ee6155b08247e0d SHA-256: 95e7ea31ab6b7e0a87dbd3a74d4abeee4329ea6a70eddaefa61b791c2de7d251
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=entropy+in+thermodynamics+pdf'. The document body, though heavily obfuscated, contains this URL, suggesting the PDF's primary purpose is to redirect users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=entropy+in+thermodynamics+pdf
    • http://files.eliotltroop.com/uploads/1/3/1/4/131438888/6550331.pdf
    • http://files.rachelhammermanart.com/uploads/1/3/1/3/131379596/zamutajonisudezap.pdf
    • http://files.ionaabbeyandclandonald.com/uploads/1/3/1/1/131164067/povexetetenewe-joterelawaritaj-folifapuma.pdf
    • http://wopupabo.masonrich.com/uploads/1/3/2/7/132710621/f205fdf4547a1.pdf
    • http://files.artbeatarttherapystudio.com/uploads/1/3/0/7/130740586/mazinawedaxexe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tokon.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/19991686029.pdf
    • https://cdn.shopify.com/s/files/1/0428/6794/9724/files/linuxopodob.pdf
    • https://cdn.shopify.com/s/files/1/0431/9939/8052/files/56774386235.pdf
    • https://cdn.shopify.com/s/files/1/0433/6726/8517/files/69937701924.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/79065566991.pdf
    • https://cdn.shopify.com/s/files/1/0443/9041/6550/files/artificial_intelligence_techniques_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/1712/5536/files/types_of_amino_acids_and_their_functions.pdf
    • https://cdn.shopify.com/s/files/1/0435/0361/6165/files/list_of_synonyms_in_english_language.pdf
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/best_cracked_minecraft_servers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/rudezunawaz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009f71.bin
89849427cc5461cb49f1190984d0ac30cc0892ee8547ebb4a6b85c2e2e3e1293		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F71 2912 bytes
font_01_sfnt_off0000a9d5.bin
97b8081e6638de1bef878ef1d920b3da4dc831e8fd8f23ec7a4fbc8100c4029d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9D5 5212 bytes
font_02_sfnt_off0000bb63.bin
0ef993c95ab5de434967244ab3eae25b72b1fac68af4b37619b8835c76384ff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB63 11276 bytes
font_03_sfnt_off0000e10f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 4324 bytes

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