Malicious PDF — malware analysis report

Static analysis result for SHA-256 10bbbae50c528058…

MALICIOUS

PDF

39.0 KB Created: 2020-09-05 18:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 901c0debecdd0b39c60b04439edaeca7 SHA-1: d4c159da539db99e0bf45bea55e7d3f49c78b952 SHA-256: 10bbbae50c528058d219491f1793c62f3f8ae86ca9b7ca9cec9014ddb68d4419
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download for 'Tencent gaming buddy emulator old version'. This link points to 'ttraff.club', which is flagged as malicious infrastructure. The document also exhibits characteristics of a link farm, containing numerous external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.club/pify?keyword=tencent+gaming+buddy+emulator+old+version
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_6065188ab8e34fb9ba84f9bcf177a299.pdf
    • https://static.usrfiles.com/ugd/87a178_228b098a133240df84a585e2fe636e99.pdf
    • https://static.usrfiles.com/ugd/451a43_a4cb46e7b38a4ea49d5168cefd58fa61.pdf
    • https://static.usrfiles.com/ugd/ecd213_f3816362a37e42bdb88328cc37c72533.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8744/files/67702626696.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nuxekenosagulowagegur.pdf
    • https://cdn.shopify.com/s/files/1/0437/8850/1143/files/tukos.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7193/files/brochures_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/0937/5383/files/aleve_direct_therapy_user_manual.pdf
    • https://static.usrfiles.com/ugd/7dd30d_1bda9fbc704242b99a55dad2c526c0c7.pdf
    • https://static.usrfiles.com/ugd/22739b_266ffad1dc5d4d58accd3102610ef740.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_7263964a5e284df1aab0730f2bfd745c.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ce3de2a0dbe44b98f7ad2a3844927c0.pdf
    • https://static.usrfiles.com/ugd/dcf9ad_4afec47a1201416e9321330ed80f47d4.pdf
    • https://cdn.shopify.com/s/files/1/0430/8254/7361/files/ittf_table_tennis_score_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/2134835119.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6582/files/wekezigulasumuwavapuwo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000506e.bin
e0e6eaebf8d7c6d0a39ff122f33bbdf9ab539cbc67936c4be43b0ed2d1e53303		 pdf-font-stream PDF embedded font (sfnt) at offset 0x506E 2900 bytes
font_01_sfnt_off00005aae.bin
0aa8be9c32ce34046f1254ed0d4cf3c8c572fc8ed3487d12e4d1b2132e5b295a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AAE 5508 bytes
font_02_sfnt_off00006d5c.bin
9990eb6148a25859f8b74b5efabc772c525cc603012286bbb50b41837cc0803e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5C 9624 bytes

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