Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e50870c472f500a…

MALICIOUS

PDF

42.4 KB Created: 2020-08-22 08:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55b2aa793854fd77d83d8929455b7a30 SHA-1: 55d0f7c3bcfa68c5ca2988f6130fc391a257386b SHA-256: 0e50870c472f500a7a8c570e0f745477eca35ecb882e98e9b9c8ba03a063e7e6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one prominently pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=beverly+marsh+sewer+scene+excerpt+pdf'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm for SEO manipulation or to host further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

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/pify?keyword=beverly+marsh+sewer+scene+excerpt+pdf
    • http://files.montevistalacrosse.com/uploads/1/3/2/6/132681315/jamedam_wafefe_mazep_navefuvub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/66821489609.pdf
    • https://cdn.shopify.com/s/files/1/0435/7632/8355/files/barish_video_song_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/42436984312.pdf
    • https://cdn.shopify.com/s/files/1/0431/5503/0170/files/overtime_request_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/lumekibirizomokane.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/53464772365.pdf
    • https://cdn.shopify.com/s/files/1/0445/2705/9103/files/ma_sociology_books_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/bkav_mien_phi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5166/3012/files/tedewedituxuwoxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7704/2325/files/2020_calendar_weeks.pdf
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/36932796859.pdf
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/deadlock_condition_in_os.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_off00006733.bin
5e28cabd25ff678ffadbcabd6f15ae8217358c6903be6f5ecd327f0187f05a23
pdf-font-stream PDF embedded font (sfnt) at offset 0x6733 5768 bytes
font_01_sfnt_off00007ac8.bin
9d9f7480480d168dd78eee296facb4e5d54ef181967025a6bf4fd1ef9cd95df4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC8 9976 bytes