Malicious PDF — malware analysis report

Static analysis result for SHA-256 04bc66ab42e09467…

MALICIOUS

PDF

69.8 KB Created: 2020-08-29 03:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9016989b5826525976e91122c8f2f9b0 SHA-1: e2920665b00dbe37a760df16ce11fee08afe5ee2 SHA-256: 04bc66ab42e09467b7767f59686292cffdb1f2362c8ea9fb76514af2e594b733
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.ru/wix?keyword=stardew+valley+chickens+are+grumpy. This URL is embedded within the document body, suggesting an attempt to direct the user to a malicious site. The presence of numerous other PDF links further indicates a link farm or SEO manipulation tactic. No scripts were extracted, but the primary malicious action appears to be redirecting the user to a potentially harmful website.

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/wix?keyword=stardew+valley+chickens+are+grumpy
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/65555205038.pdf
    • https://cdn.shopify.com/s/files/1/0450/2755/7526/files/past_perfect_vs_past_simple_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/8979/5998/files/20870393885.pdf
    • https://cdn.shopify.com/s/files/1/0434/0377/2056/files/kewomu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2198/files/wrightsville_beach_cams.pdf
    • https://cdn.shopify.com/s/files/1/0439/6787/3182/files/microsoft_infrastructure_planning_and_design_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/1552/7833/files/adobe_photoshop_free_trial_software.pdf
    • https://cdn.shopify.com/s/files/1/0428/1165/4307/files/bastards_of_istanbul_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8267/8433/files/21369178397.pdf
    • https://cdn.shopify.com/s/files/1/0436/2734/8121/files/2005_chevy_aveo_repair_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/gijadadiwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/zajaretim.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3d77273d53f48678f11c56f3c493e3f.pdf
    • https://static.usrfiles.com/ugd/b8c837_db80b0e0394b451c86e1fafbd4b6ea36.pdf
    • https://static.usrfiles.com/ugd/b8c837_1008a45a4ba04f238430997608bf6140.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb70.bin
592ec763e9c6ae023a977be4cf5e5e2cb03f7fa12696d95c663a84c6bb9d3049		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB70 5908 bytes
font_01_sfnt_off0000cf6e.bin
34fc62790072186bc29b8beb86da631a7194286229a69eef137e082cf6418e70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6E 10696 bytes
font_02_sfnt_off0000f430.bin
514ec34c774379c82780ce3b826aceada3291152a2a4734d997485cf707bbc49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 16204 bytes

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