Malicious PDF — malware analysis report

Static analysis result for SHA-256 971349233fc86850…

MALICIOUS

PDF

39.9 KB Created: 2020-09-02 20:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fa0780aa27ddd4f4639459fc3bd7ec5 SHA-1: 4a5a6b097541c0d7c9ac57b5f8447fb1649d56e9 SHA-256: 971349233fc86850290973864f97c910038d048d8902f2abda37886b4cb77a03
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL and references to other PDFs hosted on static.usrfiles.com, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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=chahunga+me+tujhe+video
    • https://static.usrfiles.com/ugd/b6edda_dcea279a4d764902bb2e5acb7f36214f.pdf
    • https://static.usrfiles.com/ugd/e2b09b_d023f73a887643e29a14a2a6f8e190df.pdf
    • https://static.usrfiles.com/ugd/3dd68e_9f7aef90914e4f0a82e87bf7c50fd0c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_9015b1e3454d4fabb526a9633a00aa3b.pdf
    • https://static.usrfiles.com/ugd/d5d855_15ee3c0bc2ac4915a854c50d99f7d7a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c3432394b27c49f6849e96a7c898cee8.pdf
    • https://static.usrfiles.com/ugd/f5a024_c6c42d1bf53548a0a644364253ae85d4.pdf
    • https://static.usrfiles.com/ugd/fedf23_042b61580ec946aea5fd59670a6c4c11.pdf
    • https://static.usrfiles.com/ugd/c1de29_cbde16af58ec4c33a07c4929fda9be92.pdf
    • https://static.usrfiles.com/ugd/99afdc_6aa5ae32130544cf9db74a2dbf623738.pdf
    • https://static.usrfiles.com/ugd/c1de29_db450cff2d2c4b68a7f9f673d023e456.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5388/files/venom_2018_wallpaper_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/7972/8281/files/canon_mg2900_ink.pdf
    • https://cdn.shopify.com/s/files/1/0432/8492/2526/files/xalamepamiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0850/files/fulton_daily_report.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_off00004b16.bin
fdc4e59aa21fc7b67fc0c7da871be866343c48bb603413c9e061f74153b0c47a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B16 4976 bytes
font_01_sfnt_off00005be5.bin
8fa754684746cf89da5dec5f1f00a1796b9bf03768045b0645f5c4c2e12c8076		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE5 9780 bytes
font_02_sfnt_off00007da0.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA0 16164 bytes

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