Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd792dc655253e4d…

MALICIOUS

PDF

54.9 KB Created: 2020-07-14 00:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb95cb75747aa9967c9e2b3aa91df0ac SHA-1: 2a4b338948a3ef9c1d582f707ab3e6448c204f4f SHA-256: bd792dc655253e4d387c9a1703482d77f21c576d8ee94db7ace47672152cc494
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits a PDF link farm, with numerous external links, one of which points to a suspicious URL. The document body appears to be malformed or obfuscated, preventing a detailed content analysis, but the presence of malicious links is sufficient to infer an attack pattern focused on redirection.

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=metso+cone+crusher+pdf
    • http://files.moragheilish.com/uploads/1/3/1/4/131407734/2340222.pdf
    • http://files.stpaulsnundah.com/uploads/1/3/0/9/130969476/1a8c26245eea31.pdf
    • http://files.pinkdazeeboutique.com/uploads/1/3/1/1/131163945/bipovuxe_jufokumofisa.pdf
    • http://files.innerheartpathways.com/uploads/1/3/2/6/132681002/46e9335.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/72350460946.pdf
    • https://cdn.shopify.com/s/files/1/0432/7076/6750/files/zelip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.pdf
    • https://rimejove.files.wordpress.com/2020/07/39092317.pdf
    • https://jararevus.files.wordpress.com/2020/07/26331069808.pdf
    • https://fapebera.files.wordpress.com/2020/07/59428114139.pdf
    • https://safizim.files.wordpress.com/2020/07/8017667577.pdf
    • https://cdn.shopify.com/s/files/1/0431/0361/7173/files/lesuxoje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/loxidunadubufurepetiverox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99913566500.pdf
    • https://cdn.shopify.com/s/files/1/0432/7325/7118/files/54317780246.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/88075317933.pdf
    • https://cdn.shopify.com/s/files/1/0430/7448/6421/files/11272630876.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tobilefoseparavako.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49726552648.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6741/files/53934694894.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/
    • https://jararevus.files.wordpress.com/202

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d49.bin
0d639e2e7eea59caa245fdb7d9cf907fe2505ab58e1e7096c2b60ebcf97dcbca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D49 4840 bytes
font_01_sfnt_off00009db7.bin
3398c2e445a4bd902b6b97caf400dbc2652bcc3ac8b1eb69d7f79f73114cdf4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB7 15664 bytes

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