Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8c8154ddd9d8ab…

MALICIOUS

PDF

42.4 KB Created: 2020-11-01 14:50:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ab7aee88b0cb7ec6d6f532ef1b72cf8 SHA-1: 73689ddd4547329b505685c6bbfc89e3e42d1b4b SHA-256: 2d8c8154ddd9d8ab9dc39e7536c4c5ebf649ab9f40af4df6adf87598fb7db3ba
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 pointing to 'https://cctraff.ru/123?keyword=tesla+roadster+cost'. Additionally, it exhibits characteristics of a link farm, embedding numerous external PDF links, one of which is 'https://s3.amazonaws.com/busutafitufe/stem_perplexors_level_c_answers.pdf'. 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://cctraff.ru/123?keyword=tesla+roadster+cost
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/60597de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/busutafitufe/stem_perplexors_level_c_answers.pdf
    • https://s3.amazonaws.com/roware/86852630524.pdf
    • https://cdn.shopify.com/s/files/1/0501/5129/3098/files/alpengeist_busch_gardens.pdf
    • https://cdn.shopify.com/s/files/1/0434/5587/3190/files/70946021602.pdf
    • https://cdn.shopify.com/s/files/1/0500/1415/9040/files/nazinudezomuminanodexo.pdf
    • https://cdn.shopify.com/s/files/1/0266/8645/6002/files/free_coin_master_spin_hunters_app.pdf
    • https://uploads.strikinglycdn.com/files/181933bb-fc97-42d8-b60b-d8d554321466/94774436669.pdf
    • https://uploads.strikinglycdn.com/files/31571e10-4fa5-4811-8866-1abb4cd36233/mu_online_guides_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0507/0300/7919/files/pusijosoxufojibutodilip.pdf
    • https://cdn.shopify.com/s/files/1/0440/9815/8744/files/fujesinebodas.pdf
    • https://s3.amazonaws.com/texifaxepag/dobigugupojixabiza.pdf
    • https://cdn.shopify.com/s/files/1/0497/6135/3889/files/how_to_download_super_smash_bros_4_mods.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_off000068e8.bin
816e20022aacbb2e3eb0e473dfc9cac89ee332b89db778c6983a4094971fb9e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x68E8 4884 bytes
font_01_sfnt_off0000798b.bin
dfd240018152596be0e788b6ffe954297f034acdf46af3c0ca37a3dbbea11954
pdf-font-stream PDF embedded font (sfnt) at offset 0x798B 10284 bytes