Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a18bec011a17ed…

MALICIOUS

PDF

33.0 KB Created: 2020-08-13 23:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 253122cee306a92a7ab3755647256f31 SHA-1: ae3497835306b4b7df8da27483e2f7a49a39d94f SHA-256: e7a18bec011a17edf51f0624aacd90561d0543a443b8175f0a2c2b9246abf5de
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised with a movie song keyword, aiming to trick users into visiting a malicious site. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and numerous other URLs, many hosted on Shopify, likely as part of a link farm to improve SEO for the malicious content. The primary malicious URL is ttraff.ru, which redirects to further 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.ru/pify?keyword=aparichithan+movie+songs+free
    • http://xesekusi.richmondavenueanimalhospital.com/uploads/1/3/2/6/132683286/4740714.pdf
    • http://files.nextstepnursery.com/uploads/1/3/0/7/130740530/3655515.pdf
    • http://files.sdgplanning.com/uploads/1/3/1/3/131398385/lopanawo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7170/files/durozozazob.pdf
    • https://cdn.shopify.com/s/files/1/0432/9734/1604/files/20953719619.pdf
    • https://cdn.shopify.com/s/files/1/0449/1198/4795/files/ancient_history_by_r_s_sharma.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/que_es_el_aneurisma.pdf
    • https://cdn.shopify.com/s/files/1/0432/9907/8304/files/16273691468.pdf
    • https://cdn.shopify.com/s/files/1/0434/6911/1449/files/82379940308.pdf
    • https://cdn.shopify.com/s/files/1/0447/5430/5175/files/cisco_catalyst_9300_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1336/files/dorakinewevuligavala.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7188/files/45602852415.pdf
    • https://cdn.shopify.com/s/files/1/0435/5509/4679/files/enum_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6919/files/dumizu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5624/2581/files/75210466009.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_off0000434d.bin
d0a8b7f8dc08039c269f0b03ef3150d6ef9fed4c70deb44b6db50f107e0e01ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x434D 5448 bytes
font_01_sfnt_off000055ae.bin
82e4b14ad493d32e3d8910ef8039c813d0ed42c01ee453d409548bb12e5e87d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x55AE 9908 bytes