Malicious PDF — malware analysis report

Static analysis result for SHA-256 109de95e29f6ce6a…

MALICIOUS

PDF

38.7 KB Created: 2020-09-01 16:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efa68756067e11a6950095873fd52dda SHA-1: 59198ef3e8c68c288284cfc7096a3998bd32b71a SHA-256: 109de95e29f6ce6ab0322b21b760e284b1628f9f5351f71e4507d5393421bb46
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.me/wix?keyword=bcbsnc+provider+manual+2018'. The document body, though heavily obfuscated, contains text related to 'bcbsnc provider manual 2018' and the wkhtmltopdf application, indicating a lure to disguise the malicious intent. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly suggest this document is part of a phishing or malware distribution campaign.

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.me/wix?keyword=bcbsnc+provider+manual+2018
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/bb13a2_3132c5a99db943cfbd08e2d0e0c892d7.pdf
    • https://static.usrfiles.com/ugd/ae15ca_e6071d4b824f4e47a11c2ef19683ec04.pdf
    • https://static.usrfiles.com/ugd/fb5067_438cff92a8dd4237a90ce28770126364.pdf
    • https://static.usrfiles.com/ugd/565485_fb5824da39b24e5ab76f5c96e30d3153.pdf
    • https://static.usrfiles.com/ugd/fe83c3_939cacb481c1421fa6cba3d089c4acdf.pdf
    • https://static.usrfiles.com/ugd/c068f8_2be1602ef6824c34a9efbb103a52a79d.pdf
    • https://static.usrfiles.com/ugd/ce14f3_fe9fa6ffb0de4ab0a91fa9ca112a7342.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e09d8b6de35499d85ff50e2c54497e0.pdf
    • https://static.usrfiles.com/ugd/2e79a6_ad1b7d8d88a14c1cbf724fc7a1c02208.pdf
    • https://static.usrfiles.com/ugd/b8c837_189392cf04394947a07e7239f084b154.pdf
    • https://cdn.shopify.com/s/files/1/0434/5164/6119/files/jekixutesim.pdf
    • https://cdn.shopify.com/s/files/1/0431/8907/6117/files/22877909022.pdf
    • https://cdn.shopify.com/s/files/1/0429/5560/4121/files/dungeons_and_dragons_basis_set.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6938/files/inverse_square_law_physics_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7525/files/national_geographic_water_our_thirsty_world.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/knee_exercises_nhs.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000579b.bin
007bc3c656305346cf9b614b27039bcaee6698c6ac2141270bd02682b4ffd159		 pdf-font-stream PDF embedded font (sfnt) at offset 0x579B 5988 bytes
font_01_sfnt_off00006bde.bin
74bc1654355a601f4fa562d25f5767354387185c2f8d159175a6b7144644f844		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDE 9968 bytes

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