Malicious PDF — malware analysis report

Static analysis result for SHA-256 b096a75837df5efb…

MALICIOUS

PDF

65.7 KB Created: 2020-08-13 18:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2de69ba050ca16d71eec73e0f2efb1d SHA-1: 018c6f9b423d0b967ea02c652e3b6c9d50d8272e SHA-256: b096a75837df5efb370c2614ffed47f8d914c839eb268038ac4dd863ce7f5df8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one identified as a malicious redirector. The primary malicious URL is https://ttraff.ru/wb?keyword=recondition%20old%20batteries%20pdf, which likely serves as a lure to a phishing or malware distribution site. The document body text, though partially obfuscated, also contains this URL, reinforcing the redirection attempt. The ML classifier strongly indicated maliciousness.

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/wb?keyword=recondition%20old%20batteries%20pdf
    • http://files.larrysserviceandtowing.com/uploads/1/3/0/7/130739379/nerarovosufu.pdf
    • http://files.mrperformancetraining.com/uploads/1/3/2/3/132302718/3876067.pdf
    • http://files.wearewestwood.org/uploads/1/3/0/8/130873877/pevitut-momor-fuzud.pdf
    • http://kulaji.claddaghcoffeecafe.com/uploads/1/3/0/8/130814575/balimezobogel.pdf
    • http://files.melbournewithkidz.com/uploads/1/3/1/8/131872149/pofetipowiwuzij.pdf
    • https://cdn.shopify.com/s/files/1/0429/9096/0799/files/super_pose_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/3111/7467/files/fekide.pdf
    • https://cdn.shopify.com/s/files/1/0436/2053/2384/files/vujin.pdf
    • https://cdn.shopify.com/s/files/1/0431/0954/8188/files/93047014959.pdf
    • https://cdn.shopify.com/s/files/1/0449/0254/7611/files/algebraic_equation_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/6764/5852/files/89734184267.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/14490041284.pdf
    • https://cdn.shopify.com/s/files/1/0431/2347/4583/files/87766881157.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0817/files/zetasenedef.pdf
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/wonudajasavale.pdf
    • https://cdn.shopify.com/s/files/1/0437/7178/9470/files/counter_strike_go_dedicated_servers.pdf
    • https://cdn.shopify.com/s/files/1/0446/2706/7043/files/tutorial_for_python_beginners.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_off0000c024.bin
192782a49b45441d1baebabc12df53bd3dfffbdb31f91260175ef90df028619b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC024 5296 bytes
font_01_sfnt_off0000d228.bin
451400b07b5445513d796015bfcf7aeede778ca7638c3fcd2368f954e436fec2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD228 11448 bytes

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