Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a1d2d4b8703603…

MALICIOUS

PDF

48.1 KB Created: 2020-09-08 19:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0852bd563f7d6ea825883603a2257eba SHA-1: 009dc5e06383818f64b6f1d4e47802725e489824 SHA-256: 23a1d2d4b870360317bd6a25305b63bfbd086f448607b3cdb961fcfabfc5aa55
152 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one pointing to a known malicious redirector. The heuristic firings indicate this is a link farm designed to direct users to potentially harmful content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector URL is the primary indicator of compromise.

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.club/wix?keyword=begum+jaan+movie++mp4moviez
    • https://static.usrfiles.com/ugd/1d64af_86d85b3860b14462becfa5f2499450a2.pdf
    • https://static.usrfiles.com/ugd/74c34a_5c22fa4803c14f76832b309a49d13cd5.pdf
    • https://static.usrfiles.com/ugd/4ae4db_ed2a63613b0b4cff8515048ba3a9f57d.pdf
    • https://static.usrfiles.com/ugd/c0b427_fa8ad517629f4715bf3e0e637f7421e0.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_0538063eb7be4d09bf1ad7724e2b1474.pdf
    • https://static.usrfiles.com/ugd/eb6612_0ac23c14a21241c8a11cf862ad59698e.pdf
    • https://static.usrfiles.com/ugd/906e9f_8337487de1b34947ab6db1b4899843d6.pdf
    • https://cdn.shopify.com/s/files/1/0432/0192/1184/files/36275897781.pdf
    • https://cdn.shopify.com/s/files/1/0431/2314/6909/files/brolly_sheets_king_single.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7002/files/93094227285.pdf
    • https://cdn.shopify.com/s/files/1/0430/8759/3632/files/36898954388.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7543/files/king_s_avatar_chinese_drama_eng_sub.pdf
    • https://static.usrfiles.com/ugd/c618e9_4fa17e96a2514266b05701e052ef0262.pdf
    • https://static.usrfiles.com/ugd/7e84b7_61c9968db9f9491aa318f3ed3ed08c8e.pdf
    • https://static.usrfiles.com/ugd/c33f71_e742db6b4a114ee69ff6c533251e83cc.pdf
    • https://static.usrfiles.com/ugd/912de2_732547d1d27d489d9efcb12fb12e8535.pdf
    • https://static.usrfiles.com/ugd/73f3b0_c3d9303295084cf8b7fdee985ad36e50.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067e5.bin
b8bc610b15554b09cc3411e244d0904d8775099142e00f3f7a644e9e9949f462		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E5 5156 bytes
font_01_sfnt_off00007985.bin
58842aab7b7b6de51df86ed030bfd76c1d1b320516757e1d882cad52b0d3db1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7985 10572 bytes
font_02_sfnt_off00009de7.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DE7 16164 bytes

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