Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bbf2c9297de6b2…

MALICIOUS

PDF

44.9 KB Created: 2020-09-16 22:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b6250522d5d6d5d87e45944c0c13b71 SHA-1: 1f6de95b6ba15d514e1ae87c7ed4d5da4ffb3f50 SHA-256: c3bbf2c9297de6b2a37a687572ef14313ccf67b79252b773c82c49e721841e57
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, directing users to 'https://ttraff.me/wix?keyword=best+sphr+study+guide+2015+pdf'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and other benign-looking URLs, suggesting a lure to a malicious 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.me/wix?keyword=best+sphr+study+guide+2015+pdf
    • https://aa71a45c-4f4f-4f7c-9b1b-78412b0148e8.filesusr.com/ugd/9f06f8_4e23f8c2e6dd4ed68a4e1aa0ff57ce1f.pdf?index=true
    • https://96025404-b176-426e-bd35-998f48bf69f4.filesusr.com/ugd/b85eb0_86ab056b21ab421e88b2347d10383a88.pdf?index=true
    • https://e2f1fac5-f9d2-477b-8f5f-de3f4a4e471e.filesusr.com/ugd/d7d6cd_305739231aa54db0830e5ebb8abd26f8.pdf?index=true
    • https://f9f32be5-8148-4b8b-b4ab-0fe26b46628b.filesusr.com/ugd/18574e_ec5d66b3bcd14ac396aa83d77573678e.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0462/5442/4218/files/76521787411.pdf
    • https://cdn.shopify.com/s/files/1/0439/8986/0510/files/tileluvevimepudo.pdf
    • https://df32483e-6a02-4c06-9596-a78c832c04b4.filesusr.com/ugd/6924eb_5ca1b9dc012e40c9badc3d1cfa9b3652.pdf?index=true
    • https://2f9aacda-23fb-4a77-ba47-d91ef33f1306.filesusr.com/ugd/8a9bcc_88c734a941c54777802f516f8cc1abee.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0438/9502/9915/files/exploratory_data_analysis_using_r.pdf
    • https://cdn.shopify.com/s/files/1/0429/1382/4927/files/18036323983.pdf
    • https://cdn.shopify.com/s/files/1/0432/1430/7496/files/wuzonekejazanasoxaniji.pdf
    • https://cdn.shopify.com/s/files/1/0435/7180/6366/files/cambridge_pet_1.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/2413449765.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_off0000640f.bin
bd0793179e1273d43f6f783852da42104a9bcf81c95c93454935d51f14014d48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640F 5328 bytes
font_01_sfnt_off00007663.bin
baef8f15745b0dd25c94884fa774a823f00a765487db67719e8d3fddf6442823		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7663 10108 bytes
font_02_sfnt_off000098c3.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98C3 4324 bytes

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