Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a953ea48eb842c…

MALICIOUS

PDF

90.3 KB Created: 2020-08-17 02:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f232d9396b83e963d8f79c6138f2297c SHA-1: 81226420050d17fd06c90fab85ed4bca6c58b4fa SHA-256: d3a953ea48eb842cf161e224760dcf121cb52123c6bb6364b8e4b374cae6a057
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF file contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Google ads certification questions and answers', which aligns with the malicious redirector URL. The presence of many external PDF links, including one pointing to a Shopify domain, suggests a link farm or SEO poisoning tactic to distribute malicious content.

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=google+ads+certification+questions+and+answers
    • http://files.beardsleebuffalo.com/uploads/1/3/2/6/132681194/d993fdad99.pdf
    • http://files.domtel.com/uploads/1/3/1/1/131164204/wekuwinoxidewaj.pdf
    • http://files.powerinbirth.com/uploads/1/3/0/7/130776503/mafafudajogudepupuda.pdf
    • https://cdn.shopify.com/s/files/1/0451/1966/8377/files/archery_king_mod_apk_game.pdf
    • https://cdn.shopify.com/s/files/1/0437/0569/6407/files/88231725687.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/nogojidi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0793/3603/files/conduction_of_heat_in_solids_oxford_science_publications.pdf
    • https://cdn.shopify.com/s/files/1/0430/7599/3764/files/apc_smart_ups_2200_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/9649/6544/files/95768339931.pdf
    • https://cdn.shopify.com/s/files/1/0438/6763/5867/files/benchmarking_interno.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/introduccion_al_dibujo_tecnico_arquitectonico.pdf
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/the_picture_of_dorian_gray_oxford_bookworms.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/tewimefage.pdf
    • https://cdn.shopify.com/s/files/1/0431/8534/0580/files/nejixemabipimiwesijodu.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_off000124fe.bin
03fc134b18543c760f45d08f0f2abf6f652b60c34fcbf5b34ff886e1d72a4047
pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 5440 bytes
font_01_sfnt_off000137a1.bin
eea441bfdb89ac82f10453e9fdc14169554f391f8142add3455b5614bba1ad27
pdf-font-stream PDF embedded font (sfnt) at offset 0x137A1 10524 bytes