Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ada993749c1c2a…

MALICIOUS

PDF

71.9 KB Created: 2020-08-31 07:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20631436b535392cf2b271a3c0e53921 SHA-1: fb190d7f0600e3d953448da454e54dd0575da371 SHA-256: c4ada993749c1c2ae1303a0816c9acae96151cb674d201c04ad2ae424a0bcd7d
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.ru, which is disguised as a 'Giinii dash cam manual'. The PDF also hosts a large number of links to other PDFs, likely for SEO manipulation to improve search engine ranking and visibility. The ML classifier strongly indicates maliciousness.

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=giinii+dash+cam+manual
    • https://cdn.shopify.com/s/files/1/0432/1958/3138/files/kafimozetaxupa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/18106098354.pdf
    • https://cdn.shopify.com/s/files/1/0437/7346/0631/files/rulawokuzitawugowiwi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/43585109211.pdf
    • https://static.usrfiles.com/ugd/b88e3d_d7bdc47feeb34f45834009e36f79df8c.pdf
    • https://static.usrfiles.com/ugd/bd5c68_599177ca50ee4973a36ddc633b3c68b1.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_7153da531e254bf1829d473e36c0ad9c.pdf
    • https://static.usrfiles.com/ugd/6cf0f5_a641742b4cb1493bbc5aa3897e2adf94.pdf
    • https://static.usrfiles.com/ugd/b3bc21_2badb9948aae4adc83db218f2bf7a3fb.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/padupupitig.pdf
    • https://cdn.shopify.com/s/files/1/0461/6739/2419/files/89869036657.pdf
    • https://cdn.shopify.com/s/files/1/0427/8065/5775/files/fodegubafunagawukenamasa.pdf
    • https://cdn.shopify.com/s/files/1/0435/8553/6159/files/9860263219.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf53d8e365f34b8cb2a280aba733265a.pdf
    • https://static.usrfiles.com/ugd/b8c837_f799a9d80fbb45e8975088f6cd2f7cae.pdf
    • https://static.usrfiles.com/ugd/9219f8_bff960eb53ec466391e684acc2eac53c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0520b94c0f5e4d7682e4512e462c7469.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_off0000db0b.bin
b023d6524429ac8e36ebe5baafac54106bed79485cc8a3838f697ec5f25b348a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 5112 bytes
font_01_sfnt_off0000ec49.bin
9dd9c907dbe1faf6fedbbd3541000fd5e0c683716c236dccd6fea1b95f0ff7a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 10760 bytes