Malicious PDF — malware analysis report

Static analysis result for SHA-256 746dc5381519076f…

MALICIOUS

PDF

44.9 KB Created: 2020-08-06 23:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8653760799094923f2081407700595c7 SHA-1: d6ce54e754c1d2c460d5f1e0e7aba16dc37e60e7 SHA-256: 746dc5381519076f3eb3846a2a836f7693b2956fed7c8a53e01d0cb1f045e48f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to manipulate search engine results. One of the primary links directs to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=swot+analysis+ppt+pdf, reinforcing the lure.

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=swot+analysis+ppt+pdf
    • http://files.uhsmini-thon.com/uploads/1/3/1/4/131410818/8559398.pdf
    • http://files.leaannlewis.net/uploads/1/3/0/7/130775362/7185956.pdf
    • http://files.joshuaspringsschools.com/uploads/1/3/0/8/130874598/gowitexerenoniw_nixuruta_muduboju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8234/2815/files/albinismo_tipos.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/31469175440.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7106/files/19417815280.pdf
    • https://cdn.shopify.com/s/files/1/0432/7810/6779/files/scp_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86662201832.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/75761602004.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/segefoxur.pdf
    • https://cdn.shopify.com/s/files/1/0433/9453/1493/files/kti_askep_bronkopneumonia_pada_anak.pdf
    • https://cdn.shopify.com/s/files/1/0438/4066/7810/files/dammit_blink_182_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/rivodana.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_off00007248.bin
3771fe99034945ed2b329a035c23d1dd656aa6ad7cf6d21ec6247e859811a5ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x7248 5236 bytes
font_01_sfnt_off0000844c.bin
d4e18c2989b7a15a35a40308609faf5811025e2dc2990b0917945afa38981794
pdf-font-stream PDF embedded font (sfnt) at offset 0x844C 10092 bytes