Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d7c709372c3266…

MALICIOUS

PDF

54.0 KB Created: 2020-09-04 23:39:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30f3a1ad7b4d9de0dfe874d94c17cf1b SHA-1: c6702feedb3590351d639134d5191d5839370162 SHA-256: f1d7c709372c3266d43e55db1ef56e4feab29322db6bb2ab5a35a4b6cd5073e6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One critical heuristic identifies a link to a known malicious redirector service, ttraff.club, which is likely used to obscure the ultimate malicious destination. The document body contains garbled text but also includes the same suspicious URL and a large number of benign-looking Shopify links, suggesting a tactic to blend malicious links with legitimate-looking ones. The ML classifier strongly flagged this PDF as malicious.

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.club/wix?keyword=tv+guide+sydney+australia+new+south+wales
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/mx_video_player_app_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5457/files/kazeziropudumowun.pdf
    • https://cdn.shopify.com/s/files/1/0435/0004/4454/files/ramraksha_stotra.pdf
    • https://cdn.shopify.com/s/files/1/0428/1355/4855/files/lukawowuromo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8656/8860/files/67537341567.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/38572900717.pdf
    • https://cdn.shopify.com/s/files/1/0437/9816/7713/files/33976994652.pdf
    • https://cdn.shopify.com/s/files/1/0433/7867/1783/files/holy_roar_chords.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/25494233442.pdf
    • https://cdn.shopify.com/s/files/1/0430/2526/8889/files/13142936573.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/effects_of_bullying_on_academic_performance.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/rikijomujologizuxikeged.pdf
    • https://cdn.shopify.com/s/files/1/0435/2606/2239/files/86812364299.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6332/files/61792715357.pdf
    • https://cdn.shopify.com/s/files/1/0466/2552/1829/files/18458784864.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8412/files/real_estate_data_api.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_off00009571.bin
cc6c7b1054090bde046ad75909308c68d54c51f005b3d10c624c01c00b39c24f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9571 5292 bytes
font_01_sfnt_off0000a781.bin
020bca652a1e56f02fa945d8e88c657de58b5b495742a1d7169ec21d03de084c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA781 10432 bytes

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