Malicious PDF — malware analysis report

Static analysis result for SHA-256 398bac3a0add67c8…

MALICIOUS

PDF

49.4 KB Created: 2020-08-14 22:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8f4b472b30b5de6862be405b73df350 SHA-1: ca0803af29f0be8cc2a74e284f32f0f9a34f49ee SHA-256: 398bac3a0add67c8ff88fe29fc2148f53850cea080bca2971f57901dc46d42f3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.com/wb?keyword=office%20solutions%20development%20pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious content. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=office%20solutions%20development%20pdf
    • http://files.remodelestimator.com/uploads/1/3/2/6/132682210/d5042cc61.pdf
    • http://files.cdelcurto.com/uploads/1/3/1/8/131856338/8491348.pdf
    • http://files.sidleymountainoutlaws.com/uploads/1/3/1/3/131384424/fomuvevufotulomi.pdf
    • http://files.sacred-journeys.net/uploads/1/3/2/7/132740533/9327399.pdf
    • http://tamib.plantingtreesbackwards.com/uploads/1/3/0/9/130969060/rababufulosuxat.pdf
    • https://cdn.shopify.com/s/files/1/0447/5407/5799/files/background_powerpoint_islami.pdf
    • https://cdn.shopify.com/s/files/1/0432/0369/0660/files/kobabuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/how_to_clear_variables_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/11112571739.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8807/files/55286248719.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/75692906268.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6602/files/19742138665.pdf
    • https://cdn.shopify.com/s/files/1/0431/5316/2389/files/34583098790.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/musculos_agonistas_e_antagonistas_tabela.pdf
    • https://cdn.shopify.com/s/files/1/0436/9294/9658/files/88862284518.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/grep_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tadigepulimo.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/
    • https://cdn.shopify.com/s/files/1/0447

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076e8.bin
831d94d5346c75ff75759cb5e95905b8fa024d7822ebc4ff8cf6ef5d7664ecf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E8 4964 bytes
font_01_sfnt_off000087c2.bin
3a24c77aa3c8c3e931d0eb98e2f82b582c7acbc91cffaf55d1fc05dc32c09822		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87C2 10116 bytes
font_02_sfnt_off0000aa2c.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA2C 4324 bytes

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