Malicious PDF — malware analysis report

Static analysis result for SHA-256 af168618df85ebb1…

MALICIOUS

PDF

47.9 KB Created: 2020-08-31 09:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb3877a4cb4a8ee63d5d6c82919ac3cb SHA-1: 4c66c04b3418d20bb30eaa8cbb09648f1252048d SHA-256: af168618df85ebb1e8e8d29693385dd0141b44fdfb8c061b8a5f62a62b97e578
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and numerous other links to external PDF files, suggesting a link farm or redirection strategy. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring the user to click on the malicious link.

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/wix?keyword=only+the+paranoid+survive
    • https://static.usrfiles.com/ugd/67f5f7_618155a0322e4d0d94f5099fb660b603.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f400e71323044a0907474fc5acfc8b7.pdf
    • https://static.usrfiles.com/ugd/99a8f2_6dd76db202124a6c950cfaacd7019c56.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_3a95dc710a284e8cb3b387f8a5d750ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_992ee16689ec42778a78798ee7fe50aa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2670/9665/files/31390795145.pdf
    • https://cdn.shopify.com/s/files/1/0447/9080/8727/files/zelavozapizexubalowura.pdf
    • https://cdn.shopify.com/s/files/1/0435/9687/3885/files/tironaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2033/files/android_apps_not_available_on_play_store.pdf
    • https://cdn.shopify.com/s/files/1/0431/8350/5570/files/non_probability_sampling_method.pdf
    • https://cdn.shopify.com/s/files/1/0430/9997/9930/files/55336244545.pdf
    • https://cdn.shopify.com/s/files/1/0433/9928/2845/files/19007143515.pdf
    • https://cdn.shopify.com/s/files/1/0429/8034/3961/files/chuyn_file_b_ngc.pdf
    • https://cdn.shopify.com/s/files/1/0431/6119/0554/files/37970015538.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_off00006476.bin
7f56b4bccf5520b380c99bddbd636cd1acecbed33bacc61713c4b53d9b5d695e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6476 5120 bytes
font_01_sfnt_off000075cf.bin
0e50cb3b81e1a2e7ebf13e0c44ebdaa1f1f4c70582a930428565f037be412508		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75CF 2628 bytes
font_02_sfnt_off000080ea.bin
a281ffe91f04a47792475f4ce6e25bb17579fc140b772d7d8460debeaae39903		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80EA 9868 bytes
font_03_sfnt_off0000a2a3.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2A3 4324 bytes

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