Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4fc3fae92c48af…

MALICIOUS

PDF

43.6 KB Created: 2020-08-31 05:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57366b11f5ae090d9f0c4f89801415b2 SHA-1: 1f8b2528951ba5fdb87ed0f0155f030da38caf08 SHA-256: 0f4fc3fae92c48af8749f28731af5e78e62e107fb5a4a5fc4274efa236d67572
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a lure for free in-game currency. This link points to 'ttraff.ru', which is flagged as malicious infrastructure. The document also functions as a link farm, embedding numerous other PDF files, likely for SEO manipulation or to obscure the malicious intent. The ML classifier strongly indicated 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=walking+dead+road+to+survival+free+coins
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/dedorusadilonimufise.pdf
    • https://cdn.shopify.com/s/files/1/0431/1184/1949/files/i_am_coming_home_song_musicpleer.pdf
    • https://cdn.shopify.com/s/files/1/0429/5639/0551/files/vunoxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/2748/8168/files/74990940405.pdf
    • https://cdn.shopify.com/s/files/1/0462/6051/9066/files/fetufupipulusagufaba.pdf
    • https://static.usrfiles.com/ugd/b8c837_13ce0eeecd6e4b1cb1a61e37d3975bd8.pdf
    • https://static.usrfiles.com/ugd/cd79e3_1cfe86d2883747bc83eefa3a6b052e78.pdf
    • https://cdn.shopify.com/s/files/1/0437/9289/2061/files/91358679028.pdf
    • https://cdn.shopify.com/s/files/1/0440/9311/2472/files/bedford_reader_12th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/8502/7746/files/14729273960.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9332/files/airland_battle.pdf
    • https://cdn.shopify.com/s/files/1/0438/5511/8501/files/lixivufuzibagajifudulanu.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4105a9085274f2aa15636327422548c.pdf
    • https://static.usrfiles.com/ugd/122077_d5f566a7b1e64aabb22c3575e5e18131.pdf
    • https://static.usrfiles.com/ugd/b8c837_855f1828950c49308e396aa98137963a.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_2a78aada844049749aa1969d3765dc10.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_off00006ccc.bin
261a370f5e0e0f412e66b59f9c02f454a65ef1c420a3e308b8be6017835014b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CCC 5328 bytes
font_01_sfnt_off00007f08.bin
d8aa7ccc4420ef185e55a9d56353d99083ce9604d6d10e47803c3636c6792a8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F08 10092 bytes