Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d71be44f98851a…

MALICIOUS

PDF

38.1 KB Created: 2020-08-20 23:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a755b3adabd5bb32514fa12c7dc74ba SHA-1: b16b44c4e50559097bd6ea098c896f8064740e32 SHA-256: 90d71be44f98851a08536d2cc93d20397408c27c81a9d1c0f67aef942c7ad79d
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, a technique often used for SEO spam or to direct users to malicious sites. One of the primary links, 'https://ttraff.ru/pify?keyword=categories+for+working+mathematician+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDF links, suggesting a coordinated effort to distribute content through a link farm, ultimately leading to malicious infrastructure.

Heuristics 3

  • 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.
  • 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=categories+for+working+mathematician+pdf
    • http://files.i2cafe.com/uploads/1/3/0/9/130969580/japobejezisuj.pdf
    • http://nobof.eclecticcolour.com/uploads/1/3/1/1/131164250/26758.pdf
    • http://files.soapbarlounge.com/uploads/1/3/0/7/130776718/luriza_bokitewakikizu_sepipe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/pathfinder_monsters_by_cr.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/72879631850.pdf
    • https://cdn.shopify.com/s/files/1/0438/3028/0352/files/lajaberikuvubonewakiwali.pdf
    • https://cdn.shopify.com/s/files/1/0429/5891/3689/files/32873651413.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/54029139968.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5809/files/wodusimadikinagik.pdf
    • https://cdn.shopify.com/s/files/1/0440/7571/2664/files/primary_english_learning.pdf
    • https://cdn.shopify.com/s/files/1/0438/6842/2309/files/protein_structure_levels_of_protein_structure.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/dj_wale_babu_song_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8333/files/45796419529.pdf
    • https://cdn.shopify.com/s/files/1/0437/7418/1534/files/kamus_bahasa_jawa_halus.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/37722289361.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_off000054fe.bin
e7b989c455f1d3d816a3afdbbe519fbbdc76243484d56509cc56b672078bcb06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54FE 5596 bytes
font_01_sfnt_off000067f1.bin
2fa9de01789d266fe3d6b1649cb1e7d240ca0ce5c1fd9a25339e38dc234547ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F1 10340 bytes

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