Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6baadec75894ed…

MALICIOUS

PDF

48.0 KB Created: 2020-08-07 08:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 293d7db6bb2085b39b4f68b8f1530ace SHA-1: e05b1b4d4ba3fba9c1dfc44fdaabc99dc6fdf0b6 SHA-256: cb6baadec75894eda58859830c1a9651715bea6be88af820f3333b51a8e7ea12
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as educational resources, but it redirects to a malicious URL. The ML classifier strongly indicates maliciousness. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further stages of an attack. No scripts were extracted, limiting the analysis of specific payload delivery mechanisms.

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=approaches+to+educational+research+pdf
    • http://files.jrpnyc.com/uploads/1/3/0/7/130775265/nududoler-gijukopevezen.pdf
    • http://vopuwevur.imftracker.com/uploads/1/3/1/4/131407005/ririlavegowopir.pdf
    • http://sarebek.superiorlogworks.net/uploads/1/3/1/4/131453494/9117218.pdf
    • http://files.thebourbonbrothers.com/uploads/1/3/1/6/131607103/noxelame-fanezutebuwali-wafevuvugivas.pdf
    • http://files.orlandocitypasta.com/uploads/1/3/2/6/132682124/lupowizugitijag_gabeme.pdf
    • https://cdn.shopify.com/s/files/1/0428/9236/1887/files/vajebusa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0697/5382/files/rajigukix.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/fewofexigeziwisisu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/91755894435.pdf
    • https://cdn.shopify.com/s/files/1/0431/4788/6743/files/ct_trang_trong_foxit.pdf
    • https://cdn.shopify.com/s/files/1/0433/9171/3447/files/madixopobabusugotetid.pdf
    • https://cdn.shopify.com/s/files/1/0431/9028/8535/files/kirovagaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8217/files/edward_said_orientalisme.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/66545528944.pdf
    • https://cdn.shopify.com/s/files/1/0433/5016/3609/files/how_to_play_rook.pdf
    • https://cdn.shopify.com/s/files/1/0437/3217/2965/files/67831912961.pdf
    • https://cdn.shopify.com/s/files/1/0439/1606/6971/files/spanish_grammar_books_for_beginners.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_off00007205.bin
9620137b3c20a8fe7ddc6ebd557908f38c37a075c16cff91c665fb66ab896200
pdf-font-stream PDF embedded font (sfnt) at offset 0x7205 5232 bytes
font_01_sfnt_off000083ca.bin
282ac74806e099e5ebc99beba5727757e92b32f519f81b4495c3819d5540e127
pdf-font-stream PDF embedded font (sfnt) at offset 0x83CA 15084 bytes