Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd20f5a0ec34bee…

MALICIOUS

PDF

45.7 KB Created: 2020-08-15 02:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2561fd631f9f335ae0d500e1cb724e21 SHA-1: 4874a4a12237b992a740e7a5d1a1e76d5b7ef932 SHA-256: ebd20f5a0ec34bee5678bda36ad2a5329ad068990e8466ad2136c2be4733714a
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.com/pify?keyword=rassembler+des+fichier+pdf+en+un+seul'. Additionally, it features a PDF link farm, with the first URL being 'https://cdn.shopify.com/s/files/1/0432/5546/4104/files/tor_browser_macbook_air.pdf'. The ML classifier also flagged this PDF with high confidence. The document body contains obfuscated text and embedded URLs, suggesting an attempt to lure users to malicious content.

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.com/pify?keyword=rassembler+des+fichier+pdf+en+un+seul
    • http://files.leslie-marshall.com/uploads/1/3/0/8/130814492/3105372.pdf
    • http://files.btwmovie.com/uploads/1/3/1/1/131164130/vimujalop_lesoresubapu_jevijebegob.pdf
    • http://files.nashvillebluetones.com/uploads/1/3/1/4/131438071/ketojemogaso.pdf
    • http://laxatijaz.happyyummychicken.com/uploads/1/3/1/4/131438234/6022724.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/tor_browser_macbook_air.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6165/files/20652499137.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6909/files/omsa_8._4_windows.pdf
    • https://cdn.shopify.com/s/files/1/0432/0854/0315/files/best_gba_emulator_for_android_2018.pdf
    • https://cdn.shopify.com/s/files/1/0430/5911/8229/files/svu_theme_song.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1217/files/angularjs_tutorial_for_beginners_step_by_step_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/8782/1984/files/fafizobalusaxilulol.pdf
    • https://cdn.shopify.com/s/files/1/0437/9879/0301/files/ielts_general_writing_task_1_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0434/1363/5226/files/52552491084.pdf
    • https://cdn.shopify.com/s/files/1/0433/4977/0395/files/79866761535.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1813/files/forge_1._11._2_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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070b1.bin
0248a80b75c5016ed85e35173e407d21fb6137ac8e743a3d3d06fb0119028bdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B1 5540 bytes
font_01_sfnt_off00008359.bin
2611199b1dbfe3d16d185691557df00e90d1218f1de8ef01ed31b4e88ea03ebb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8359 11668 bytes

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