Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f81ed94f33ca7b4…

MALICIOUS

PDF

40.2 KB Created: 2020-08-18 20:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a98f27e0fe6ca54b6f2ac508cb8de72d SHA-1: c234e14e362c79d6356ce9702bd65a21854da565 SHA-256: 6f81ed94f33ca7b42c30e3af904580b9563ffa2989da74cc788acdf3e181c47f
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as information about macOS 10.15 beta, aiming to trick users into clicking it. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded links, many pointing to benign Shopify URLs, suggests a link farm or SEO poisoning tactic to obscure the malicious destination. No scripts were extracted, but the embedded URL itself is the primary attack vector.

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.cc/pify?keyword=mac+os+10.+15+beta
    • http://lujax.ksslibrary.org/uploads/1/3/0/8/130814328/kosoxed-togomoze-rafokun-buwut.pdf
    • http://filumuf.creaturesofchichester.com/uploads/1/3/1/4/131453598/jutawukazo_rilidokamiku_dijoziguroxazil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1304/4386/files/rifesirotedebe.pdf
    • https://cdn.shopify.com/s/files/1/0432/4222/5831/files/lotegadugejodewarun.pdf
    • https://cdn.shopify.com/s/files/1/0438/4443/6128/files/vovavajugen.pdf
    • https://cdn.shopify.com/s/files/1/0439/8641/9870/files/bomazid.pdf
    • https://cdn.shopify.com/s/files/1/0433/2827/4582/files/gisugojujozosikuvedakufor.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/37502808981.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/xuxejibovisit.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/bushnell_yardage_pro_sport_450.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6649/files/ccna_routing_and_switching_200_125.pdf
    • https://cdn.shopify.com/s/files/1/0431/5466/9729/files/sevegikuxukurejeritadefek.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_off00005e62.bin
2b369f2b7b0e8f3ed8400b0e288cc1dedb348c5a6b2f0269753751904cf5deb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E62 5160 bytes
font_01_sfnt_off0000700f.bin
90aa95ff9c95bf9bbda5e6025a5ab6d8e46c968fbdb01cf3968c0ca61442bf70
pdf-font-stream PDF embedded font (sfnt) at offset 0x700F 10640 bytes