Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5360a17f2c1959a…

MALICIOUS

PDF

51.7 KB Created: 2020-08-19 09:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b90d9a6a22cb16f21d224a284c90227 SHA-1: 8fc7bbc24dc87a8c3e93c8b4f4952cb2e7a261fb SHA-256: b5360a17f2c1959a9029c4d5098a93d5c7b73bfe2e202a193f76a82ba5204fe7
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 pointing to 'https://ttraff.ru/pify?keyword=epreuve+brevet+report%25C3%25A9'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs hosted on domains like cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via the embedded 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.ru/pify?keyword=epreuve+brevet+report%25C3%25A9
    • http://files.peacepartners.co.uk/uploads/1/3/0/7/130740464/8809852.pdf
    • http://files.lilybites.com/uploads/1/3/2/6/132681749/nefufidetejiv-fepovigez-ralelamivawone-bifemu.pdf
    • http://files.jonastinius.com/uploads/1/3/1/3/131380870/2203791.pdf
    • http://jetasez.caitlintrude.com/uploads/1/3/0/7/130738732/1792495.pdf
    • http://files.krromero.com/uploads/1/3/0/7/130739470/xakuzekupuduxe_giniji_bamisowedo_kokuxepi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7020/files/the_banking_act_of_ghana.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/3563573685.pdf
    • https://cdn.shopify.com/s/files/1/0435/0718/7872/files/english_word_stress_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/kamojumuzeju.pdf
    • https://cdn.shopify.com/s/files/1/0434/9467/0498/files/14337341868.pdf
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/nudaloxize.pdf
    • https://cdn.shopify.com/s/files/1/0427/7485/5846/files/mechanics_of_fluids_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1194/files/infinity_alt_code.pdf
    • https://cdn.shopify.com/s/files/1/0428/1863/3894/files/gowuzibiwopobiwetoxunaze.pdf
    • https://cdn.shopify.com/s/files/1/0428/4124/3814/files/republic_commando_cheats.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_off000076ab.bin
4de725bada14598a718047578aa26a7ed3aac56c7cd7bcb85fa1cc00afafca86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76AB 4692 bytes
font_01_sfnt_off00008669.bin
ed3d398bfbe5e4341df90ca5f9eb8f64ba1b8c8edf53e12fd294569c8766e229		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8669 10608 bytes
font_02_sfnt_off0000aaa3.bin
fe139538347d724e6b27dab22ead91fbb1eb3470a850438049392072e7f85921		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAA3 16208 bytes

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