Malicious PDF — malware analysis report

Static analysis result for SHA-256 38362c59757a3c1f…

MALICIOUS

PDF

36.5 KB Created: 2020-09-01 17:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 367465f4bbf5820316a6c51bcbd9aa1a SHA-1: 758b4102047c6f824cd48f890778d27ff89acd97 SHA-256: 38362c59757a3c1f5fc84ad47d2ea28e050909b8a37dabe50dea21ede5923037
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.link/wix?keyword=browsec+vpn+apk+old+version', is likely used to lure users into downloading malicious software. The file also contains a large number of embedded links, many pointing to 'static.usrfiles.com', suggesting a link farm or SEO poisoning tactic to improve search engine ranking for malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.link/wix?keyword=browsec+vpn+apk+old+version
    • https://static.usrfiles.com/ugd/902d29_e3600203b0f144e0a7da8dbfbef7b797.pdf
    • https://static.usrfiles.com/ugd/b8c837_b163dd7a12994e479ffc31d4ffef78a0.pdf
    • https://static.usrfiles.com/ugd/15d534_e93aac722ba047bb8ef65fa1b2632358.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ecca8e6416e440db3b65cac44bffcda.pdf
    • https://static.usrfiles.com/ugd/b8c837_47b202d7a54d49bcb8fff20e4828ace3.pdf
    • https://cdn.shopify.com/s/files/1/0432/6224/7075/files/research_articles_in_accounting_and_finance.pdf
    • https://cdn.shopify.com/s/files/1/0461/8836/3929/files/numidek.pdf
    • https://cdn.shopify.com/s/files/1/0429/5370/3590/files/shrimad_bhagwat_geeta_in_bengali_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2437/5194/files/dapidomeroxaboxewukepaj.pdf
    • https://static.usrfiles.com/ugd/ee6770_7daff9e2c36447e88398d4e1b5c31cb8.pdf
    • https://static.usrfiles.com/ugd/83f04e_5e731e174fe848ac8601f78c166b38a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d6d05ba13cc4be48b865d1ca7e988b5.pdf
    • https://static.usrfiles.com/ugd/a18aa6_a4102fd8ac4f4211a0a1b0c190e0de34.pdf
    • https://static.usrfiles.com/ugd/b8c837_a33d3cda790a4d43ba951291a5ab1ebf.pdf
    • https://static.usrfiles.com/ugd/625844_c2620d14039e47ee8703555d542968d5.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b93.bin
6d56a2c2cf633dae80050f897d86a245b7ba8cb449b3a0aba11891b21289297f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B93 5332 bytes
font_01_sfnt_off00005de1.bin
8edb361c58fd72ebc2b848aa39e36787dba484b853ed9871d561a2054832eb94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE1 12964 bytes

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