Malicious PDF — malware analysis report

Static analysis result for SHA-256 91762b1e0f8d9441…

MALICIOUS

PDF

45.2 KB Created: 2020-08-31 06:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f454505564bd6c3a368f1ceec6d25c5c SHA-1: 70679611e7f6dc2c9ebd89d24533aa28ff80d400 SHA-256: 91762b1e0f8d94410e78b1726d339fb002d1d0670e9529481d4d862424476087
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.ru/wix?keyword=exercices+d%25C3%25A9terminants+possessifs+et+d%25C3%25A9monstratifs+cm1, is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to French grammar exercises, suggesting a lure to disguise the malicious intent. 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=exercices+d%25C3%25A9terminants+possessifs+et+d%25C3%25A9monstratifs+cm1
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/67574756328.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/rejoma.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7599/files/nakuwuxex.pdf
    • https://cdn.shopify.com/s/files/1/0432/9416/3109/files/rokabanosibakamig.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1061/files/atp_tennis_schedule_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/3748/9309/files/53913672534.pdf
    • https://static.usrfiles.com/ugd/97493d_7744d23c05b24654a7ccaa60a9321953.pdf
    • https://static.usrfiles.com/ugd/b8c837_49723570578744938ae893b0c9c2b14f.pdf
    • https://static.usrfiles.com/ugd/b8c837_09866f46679549229b369d8bef85c2c7.pdf
    • https://cdn.shopify.com/s/files/1/0431/0066/8065/files/74915001389.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5387/files/17616054859.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_off00006bc9.bin
712ce186f950195c863002e2d0da52aeb042d65727509a19d41332933f1123ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC9 5488 bytes
font_01_sfnt_off00007e1d.bin
66457682e36c19fdfa395b005af090c74f5afe33e0685c200636472a9b8eb50b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E1D 12804 bytes

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