Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b753965f9414e0…

MALICIOUS

PDF

47.3 KB Created: 2020-09-01 10:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc408907cf19c4a2e8561f09170a5e5f SHA-1: 5bde47cc17d809822f91464c19ac8f32655cc63f SHA-256: d9b753965f9414e030d227d9d9622f782c83377a00021bd04fd7eff619ef30a8
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The embedded document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. The primary malicious URL is https://ttraff.ru/wix?keyword=griffith%2527+s+bacterial+transformation+animation, which is likely used to redirect the user to a malicious site.

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=griffith%2527+s+bacterial+transformation+animation
    • https://static.usrfiles.com/ugd/0d002d_7c8f85f434ab46059058f04f677f732f.pdf
    • https://static.usrfiles.com/ugd/d5cf39_7879210c122a4cec8c856c8b1ebb179b.pdf
    • https://static.usrfiles.com/ugd/0adedf_09de6ad1abf24bbdb724b3715c738985.pdf
    • https://static.usrfiles.com/ugd/34e21e_3c4896bafe02456ab2b9c01781e49ab1.pdf
    • https://cdn.shopify.com/s/files/1/0428/5333/5207/files/lol_auto_chess_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8386/6018/files/vogozopi.pdf
    • https://cdn.shopify.com/s/files/1/0439/8612/4958/files/koninilivuxutirafod.pdf
    • https://static.usrfiles.com/ugd/b8c837_a24a88469b464640ac7ac70c9027dbc3.pdf
    • https://static.usrfiles.com/ugd/d5415a_6738991deca04db6aeb2d599bad10cf7.pdf
    • https://static.usrfiles.com/ugd/b8c837_727369acb38440cc9e82b2393f2d1ed3.pdf
    • https://static.usrfiles.com/ugd/162fe6_e0a539e3447c42fcbcdc0f1c2acab37e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c38f64e06c6438f9b7e65ccef2aafa4.pdf
    • https://cdn.shopify.com/s/files/1/0431/0794/2549/files/disuxeruniruweravov.pdf
    • https://cdn.shopify.com/s/files/1/0441/1283/8808/files/surowajaxinevirazur.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_off00007a23.bin
ca20171aaa1749f3a794c23598328cfd2e9c96d7062a88ecb8ea5b5cb39745b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A23 5328 bytes
font_01_sfnt_off00008c21.bin
32ef0c1d4344352682deda3f42e510b25c0357fa6e1a9dfd5a9bd360c309241c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C21 10388 bytes