Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f405971834eab26…

MALICIOUS

PDF

39.9 KB Created: 2020-09-02 16:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1aa81a64c35d28ed2cb040175f4fa1b9 SHA-1: dd240abd91d956b91aeb0fc1c42edd42e3bdad30 SHA-256: 1f405971834eab26cfab809ad65297bd594bb2343f80c0c092068176e10753af
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also features a PDF link farm, with numerous links pointing to Shopify-hosted PDF files. The primary malicious URL identified is https://ttraff.ru/wix?keyword=hammered+antique+copper+sheets, which is likely used for redirection or to host malicious 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/wix?keyword=hammered+antique+copper+sheets
    • https://cdn.shopify.com/s/files/1/0434/5682/3453/files/chloroplast_structure_and_function_coloring_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/2412/0984/files/76541337443.pdf
    • https://cdn.shopify.com/s/files/1/0433/1362/7294/files/xupegoluwigozogejefugaloj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9854/6082/files/51553074277.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bipifapokuwegi.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f165b50ab104c9c8197b1a3a659bd3d.pdf
    • https://cdn.shopify.com/s/files/1/0432/9255/7462/files/20215681323.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5993/files/59012010048.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/agents_of_socialization_in_sociology.pdf
    • https://static.usrfiles.com/ugd/430cb2_57d08100e96e44c2a274aacb04bfd238.pdf
    • https://static.usrfiles.com/ugd/866690_92a98492e91b4577956c817e979e9495.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0e5f779e2c14160ace742a8223cfc19.pdf
    • https://static.usrfiles.com/ugd/37428b_6f6d07bab7e848d083ed871de702c15e.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_off00004d95.bin
936960822cee35bf264989b4bc84d99f83b12d2e29e82fd8e88c2d5f5e77f55a
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D95 5252 bytes
font_01_sfnt_off00005f30.bin
ee3c47044ee9ded592f18b0d3bd483e8566c42bf745f39d93344298e9527c9a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F30 10508 bytes
font_02_sfnt_off00008313.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x8313 4324 bytes