Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4739ac998635059…

MALICIOUS

PDF

40.7 KB Created: 2020-09-20 09:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fcc6cb940881412f15f592a79f6ea8a SHA-1: e4e5a47c77ef271f3d1e5b1003f9f5ce91f32e76 SHA-256: f4739ac9986350596e04f8173b8af66542c5a31a853dc834f50a3bd36825bc71
152 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, pointing to 'https://ttraff.me/wix?keyword=war+thunder+dive+bomber+guide'. This URL is presented within the document body, disguised as a guide. The PDF also exhibits characteristics of a link farm, with numerous embedded links, many pointing to Shopify domains. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering through a deceptive link.

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=war+thunder+dive+bomber+guide
    • https://cdn.shopify.com/s/files/1/0436/9537/4489/files/np246_transfer_case_rebuild_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/0494/4807/files/fluke_5720a_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0465/4769/7814/files/53383879441.pdf
    • https://c72f1a15-55af-4cce-b5b2-b864ad354631.filesusr.com/ugd/eeb7bd_a8d4844e24a846ad9aa2742f8bb7b2bd.pdf?index=true
    • https://c14cc345-911d-454a-bcb7-fecf7bd44500.filesusr.com/ugd/c162b3_238f869f8544435e85a9973af97f2be3.pdf?index=true
    • https://0f744603-e9fc-48f1-956c-499d100cf42f.filesusr.com/ugd/e8506d_fc6f55d336084286b1bb6f92219d8549.pdf?index=true
    • https://dba22918-f542-4810-97c9-b4ae9120b5dc.filesusr.com/ugd/d3758e_942cb53721494b15a80dd0e4dfb6db6e.pdf?index=true
    • https://19a2d89a-1ab6-4696-af7b-f4ebc06642ea.filesusr.com/ugd/f91cf1_671aeddbfe094e13a55e7d2cadb766f2.pdf?index=true
    • https://13196c31-f4f3-4669-9054-1cc90a3f9ccb.filesusr.com/ugd/e6092c_f6edb9f714424a41a377d022dad7377e.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0438/1265/1170/files/18060262437.pdf
    • https://cdn.shopify.com/s/files/1/0427/9648/2727/files/todepusidakesudilegadiwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4940/2024/files/associations_incorporation_reform_act_vic_2012.pdf
    • https://cdn.shopify.com/s/files/1/0461/4573/2771/files/informao_nutricional_batata_frita_mc_donalds.pdf
    • https://cdn.shopify.com/s/files/1/0432/6909/5590/files/logo_quiz_answers_level_97.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006280.bin
003586c8777816fa5a2e4979efef70649ede7eb6780295887adc221ec7eb1a26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6280 5244 bytes
font_01_sfnt_off00007437.bin
823a9e822d5e7eb27b543e474da92e806f411c3089079a8b3c3a77e80845c6ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7437 9928 bytes

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