Malicious PDF — malware analysis report

Static analysis result for SHA-256 8794f8da6df23dc4…

MALICIOUS

PDF

40.3 KB Created: 2020-08-25 17:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2d0b2c2715698250b98c04a8aed6515 SHA-1: 864d0b42018c1a6e15896be4b006b2e15e2ad41f SHA-256: 8794f8da6df23dc465942d8071990a1de34abdeb3195501978794f0493c39b4c
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of embedded links to other PDFs, indicating a link farm designed to obscure the ultimate destination. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a phishing or scam campaign, likely aiming to lure users to malicious 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.com/pify?keyword=ate%25C5%259F+ve+su+3+pdf+oku
    • http://files.shermansmallengines.com/uploads/1/3/1/4/131406717/fbfeba.pdf
    • http://tugilu.nicholson1968.com/uploads/1/3/1/3/131380480/nekolur.pdf
    • http://files.skardamaplefarms.com/uploads/1/3/0/8/130815095/rofevewag.pdf
    • http://medukiz.gandstlpc.net/uploads/1/3/0/8/130874134/fozitutegitawaburi.pdf
    • http://nagajiba.gaenvirothon.com/uploads/1/3/1/4/131453130/7f66e00faf0b0e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/8141/4296/files/59557720539.pdf
    • https://cdn.shopify.com/s/files/1/0436/1145/5645/files/nipinegek.pdf
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/dragnet_aptitude_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/7439/6065/files/cheat_engine_apk_root.pdf
    • https://cdn.shopify.com/s/files/1/0437/8312/7201/files/xabatusoxowubi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7274/1791/files/game_auto_chess_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0439/9906/8318/files/fujadekevijedafejaru.pdf
    • https://cdn.shopify.com/s/files/1/0430/6331/2533/files/84647584824.pdf
    • https://cdn.shopify.com/s/files/1/0439/5443/8302/files/free_printable_calendar_template_march_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9546/files/bollandbranch_sheets_canada.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_off00005c8f.bin
3f6c2fe697dcb4808535a93cd21d04cef6496c7ffd2c96253f6b4b88bf27f8d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C8F 5224 bytes
font_01_sfnt_off00006e02.bin
ace6cee6b363d0e7058637b576c8d11b14849e7c12e11f88f395070903201616
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E02 11784 bytes