Malicious PDF — malware analysis report

Static analysis result for SHA-256 46054084d6a3902b…

MALICIOUS

PDF

36.8 KB Created: 2020-10-23 23:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b94f12a3240c79ea7c44db7b4bfc571d SHA-1: ecf2d8e68bc95a499dd2cad92178de097133b2b6 SHA-256: 46054084d6a3902baa54354d0e24568594c09235950e706b198e9b9aac2402e2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. This suggests the document is likely part of a link farm or SEO manipulation scheme to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous links points to a redirection attack.

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/strik?keyword=waec+examiners+report+2016
    • https://cdn-cms.f-static.net/uploads/4367668/normal_5f90e2ede0604.pdf
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f9127509a002.pdf
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5f8b8eaddbdb4.pdf
    • https://cdn-cms.f-static.net/uploads/4370303/normal_5f8ed0c2dcb6b.pdf
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f92a9038a6c9.pdf
    • https://cdn-cms.f-static.net/uploads/4383680/normal_5f92365eb87d9.pdf
    • https://cdn-cms.f-static.net/uploads/4386828/normal_5f92c84b4df64.pdf
    • https://cdn-cms.f-static.net/uploads/4372673/normal_5f8f3d6206e15.pdf
    • https://cdn-cms.f-static.net/uploads/4375088/normal_5f90c212cabe7.pdf
    • https://cdn-cms.f-static.net/uploads/4369524/normal_5f8bef37ad2a9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0466/3587/6517/files/fruits_basket_ritsu.pdf
    • https://cdn.shopify.com/s/files/1/0481/0201/5139/files/crafting_guide_minecraft_1.12.2.pdf
    • https://cdn.shopify.com/s/files/1/0482/2899/1130/files/download_revolt_2_multiplayer_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/8226/0384/files/hp_probook_4530s.pdf
    • https://cdn.shopify.com/s/files/1/0432/2361/3595/files/paw_paw_ridge_farm.pdf
    • https://cdn.shopify.com/s/files/1/0434/7956/4448/files/codapay_apk_dragon_nest.pdf
    • https://cdn.shopify.com/s/files/1/0433/4115/2406/files/hunger_games_catching_fire_free_online_123.pdf
    • https://cdn.shopify.com/s/files/1/0434/3886/6597/files/primary_science_book_4.pdf
    • https://cdn.shopify.com/s/files/1/0502/1673/0799/files/4501665186.pdf
    • https://cdn.shopify.com/s/files/1/0436/7125/7241/files/android_oreo_go_apk_download.pdf
    • https://s3.amazonaws.com/salade/wijajamojuzepuwezifi.pdf
    • https://s3.amazonaws.com/dovulavavo/amaravati_kathalu_book.pdf
    • https://s3.amazonaws.com/voxazedisula/epfo_kyc_form.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_off00005199.bin
9532ae69130b020da66fafadcc7c1c4367944f35010d790fa5dd4efb7a7a3310		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5199 5608 bytes
font_01_sfnt_off000064ad.bin
c902b0ede626271b57fc8d3d3a342acb6957720a9452f5f02dd27c92678f56f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64AD 9652 bytes

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