Malicious PDF — malware analysis report

Static analysis result for SHA-256 125be1c73f2e2673…

MALICIOUS

PDF

40.8 KB Created: 2020-08-31 13:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a59249649f73b10a12cfed5f2a057b57 SHA-1: d687a78388d13e08f9aa588cda9eceada4bcf513 SHA-256: 125be1c73f2e267302498f49b59b576ef19547755c65150dd17d68ec1fa42da6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=gantt+chart+excel+2007+template+free'. The document body, though heavily obfuscated, contains this URL and references a 'Gantt chart excel 2007 template free', suggesting a lure to disguise malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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=gantt+chart+excel+2007+template+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_677c9c0c42f24a5da0b7b38a52e464fa.pdf
    • https://static.usrfiles.com/ugd/cafc24_1463e818f3e84c0fbbcfc47186c44750.pdf
    • https://static.usrfiles.com/ugd/d162e3_8ab3d9ff161547ec820b5d0a89b23cd4.pdf
    • https://static.usrfiles.com/ugd/b8c837_abb20bad16374a96ba6a072e9a25c470.pdf
    • https://static.usrfiles.com/ugd/3aee12_11a742859807499ca979a6b64459e239.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_52db215b6b4a41e7871c11d82c10b5c3.pdf
    • https://static.usrfiles.com/ugd/b5aed9_2fef51635b8844a3a353ec1321d5f613.pdf
    • https://static.usrfiles.com/ugd/4ae4db_c187e67ee434482faf6de4ccd6d1f48f.pdf
    • https://cdn.shopify.com/s/files/1/0455/6242/9605/files/41034776659.pdf
    • https://cdn.shopify.com/s/files/1/0438/8493/7384/files/kagutusuforanod.pdf
    • https://cdn.shopify.com/s/files/1/0432/3144/5149/files/2014_nissan_altima_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/5513/7447/files/kaliri.pdf
    • https://static.usrfiles.com/ugd/b8c837_71eaf389f3d94dfd8354dcb8484d49b1.pdf
    • https://static.usrfiles.com/ugd/314c35_034097cb7fcd4a98a1cc09402ad15219.pdf
    • https://static.usrfiles.com/ugd/c7a620_058dedc5bff14a5e8355c1a75acf1354.pdf
    • https://static.usrfiles.com/ugd/b8c837_e934b1eb7db94ee79e3b7e0d26bc9e27.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d00b330d89e41bbb84a22664eb146c1.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000616c.bin
4b1b54e80199921e27b9803f8c616f560c10304eed398ebd24b6122b1d3b8eab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616C 5532 bytes
font_01_sfnt_off00007422.bin
1cc5aaac924f80a86b3699bd1db744fd1bb94a5674284ea6f48c26c17dd97e91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7422 9808 bytes

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