Malicious PDF — malware analysis report

Static analysis result for SHA-256 b174754d63cc4d38…

MALICIOUS

PDF

55.1 KB Created: 2020-08-31 14:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca795b6f61f90f8876c1cbebd4ed58be SHA-1: 6373257147f7e58a5c797898b52aebf9aa4bd145 SHA-256: b174754d63cc4d381238c25f362e48943a7a7172e876a1da411deca25591152c
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a high number of external links, characteristic of a link farm. One of these links, https://ttraff.ru/pify?keyword=vcd+cutter++full+version, is identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to software and URLs, suggesting a lure to download or access potentially 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.ru/pify?keyword=vcd+cutter++full+version
    • https://static.usrfiles.com/ugd/b8c837_89ad23fa5c5d4c0ca8e745aeb109c8d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3438c9ce42e43fda0f973d6262c13d3.pdf
    • https://static.usrfiles.com/ugd/221f3a_ade92e45d1a449679c189529fd467df8.pdf
    • https://static.usrfiles.com/ugd/430cb2_88b7ee6d3c1042088c88eec337ef9f07.pdf
    • https://static.usrfiles.com/ugd/b8c837_58a5cd592390491e80ecaffb9388e4cf.pdf
    • https://static.usrfiles.com/ugd/ae059d_b5ef2a68b81b4774913b8c0b223f552d.pdf
    • https://static.usrfiles.com/ugd/299074_371d0a106c9a459aaf904a182e9a9a71.pdf
    • https://static.usrfiles.com/ugd/8ab72e_7206f165645940dbaf26c11faf416055.pdf
    • https://static.usrfiles.com/ugd/9d869b_fc99b23cba314da78e91802558b3005e.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_2d47357478d2418c92f43b6987cf23f8.pdf
    • https://static.usrfiles.com/ugd/277b62_714a8f6c10c34451bf48a3e548313fa8.pdf
    • https://static.usrfiles.com/ugd/b8c837_89ca5d07582545b3a6e3f7cf3843dbbc.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zemeletitofugawekabol.pdf
    • https://cdn.shopify.com/s/files/1/0433/8951/7973/files/36851875464.pdf
    • https://cdn.shopify.com/s/files/1/0430/2526/8889/files/32851383426.pdf
    • https://cdn.shopify.com/s/files/1/0439/1455/9656/files/54736417539.pdf
    • https://cdn.shopify.com/s/files/1/0433/4210/2679/files/hindustan_amravati_newspaper.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
stream_006_off0000a430.bin
6b569f71f908dd1b59adc5233b0fd88da051fd55ac5c4917954dde0f9d2fb5d6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA430 24836 bytes
font_00_sfnt_off00006ff7.bin
e6f14487a622b304992d945c278cff091caba37df6c75824701856591a296284		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF7 4828 bytes
font_01_sfnt_off00008081.bin
cf02eda33295479e92df2baf2cdc179ba3093dc7f824e7f3b2c9f0a87bdf5fdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8081 10388 bytes

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