Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4218aa2e30c3e6e…

MALICIOUS

PDF

39.8 KB Created: 2020-08-30 11:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 283f386a5202477889dad677fc6702bf SHA-1: 4e5a4fc4210dcaea24b8862d103b6f7df294621d SHA-256: b4218aa2e30c3e6ed70d974b8ae0db010601d9d34af6de6324b9456c8f077fe9
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=sistemas+de+tierras+electricas'. Additionally, it hosts a large number of external PDF links, many of which are hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. The document body contains obfuscated text and the malicious URL, indicating an attempt to lure users to a potentially harmful site.

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/wix?keyword=sistemas+de+tierras+electricas
    • https://cdn.shopify.com/s/files/1/0444/3960/1318/files/vurikinisabenejagavupu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9275/4076/files/josija.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/49760172322.pdf
    • https://cdn.shopify.com/s/files/1/0430/9568/7328/files/nusenumowa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/off_road_car_racing_games.pdf
    • https://cdn.shopify.com/s/files/1/0433/1916/5086/files/bulaklak_ng_city_jail.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/march_of_the_penguins_movie_questions_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/5836/3544/files/85049790124.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4344/files/vejavofeluvarazujil.pdf
    • https://cdn.shopify.com/s/files/1/0429/5704/5916/files/adtran_netvanta_838t_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/6139/3046/files/almogavar_sin_querer_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/hp_pavilion_f1703_power_cord.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_off00005c79.bin
8bcc194cf599b26331ad8fac2176e6b15542a948171f41b2e9e7e5f26461dedc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C79 5188 bytes
font_01_sfnt_off00006def.bin
9e9548703f5dd4f1d051a77efff9437da0c73aa42aa9433a265dd2791a374949
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEF 10864 bytes