Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbc79e62268e802…

MALICIOUS

PDF

52.1 KB Created: 2020-09-05 09:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10c1d3389b8e2513b8e69cad69ea1044 SHA-1: 625af06d0b99836a89eb4c4557ac01b673abae47 SHA-256: 8dbc79e62268e802c7a19d1fb1477d1fb87ac9a33a85a94a63a1fa783d6b046d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.club/wix?keyword=adobe+reader+linux+64+bit'. This indicates a social engineering lure, likely attempting to trick the user into downloading malware or visiting a phishing site. The PDF also contains a mass external link farm, with many links pointing to Shopify domains, suggesting an attempt to obscure the malicious destination. The ML classifier strongly supports the malicious nature of this PDF.

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=adobe+reader+linux+64+bit
    • https://cdn.shopify.com/s/files/1/0429/2994/6787/files/88574660546.pdf
    • https://cdn.shopify.com/s/files/1/0433/0464/8859/files/wondershare_data_recovery_software_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/karexunabu.pdf
    • https://cdn.shopify.com/s/files/1/0469/5012/1633/files/whatsapp_status_video_2018_free_0.pdf
    • https://cdn.shopify.com/s/files/1/0429/9689/1807/files/notes_of_data_communication_and_networking.pdf
    • https://static.usrfiles.com/ugd/a42eed_80e2ef868b7046aca4a145c29bea253b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2f34cd483544153a5171f0f43347676.pdf
    • https://cdn.shopify.com/s/files/1/0435/1560/9243/files/90739160235.pdf
    • https://cdn.shopify.com/s/files/1/0431/9923/4203/files/xukim.pdf
    • https://cdn.shopify.com/s/files/1/0432/8767/5036/files/35289291040.pdf
    • https://cdn.shopify.com/s/files/1/0429/0635/3823/files/speak_now_digital_booklet_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/63583809724.pdf
    • https://cdn.shopify.com/s/files/1/0431/2688/2471/files/ansys_workbench_15_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0460/3405/9428/files/kenomujakaguxo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f0c.bin
944b3d405663cbc686d29ba1ccf5ad0b95eb572e0c15c253bf82330f79d7d9fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0C 5080 bytes
font_01_sfnt_off0000806b.bin
fd61fc4bfac5d9f7213fd29a89709ed5ccbc48d3734331858120a7aac39f7ec6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x806B 14024 bytes
font_02_sfnt_off0000ad40.bin
4bf7462e787791ee30cced4e4a0065977ba460b587ec5e4d0bf31a1282398818		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD40 16416 bytes

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