Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa21d6cd2a6faca4…

MALICIOUS

PDF

49.1 KB Created: 2020-07-23 03:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef6a47a4bfeff90fec471644ec528d2d SHA-1: 9e4620e4d1c20c2d14a0eb2ae42c2aa057031743 SHA-256: fa21d6cd2a6faca4ccc2fb9a3257e935e9dc437b0872b8d252c357b8c5e2bed7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, forming a link farm designed to redirect users to malicious infrastructure. The primary redirector URL is ttraff.ru, which is flagged as malicious. The document body, though heavily obfuscated, appears to be a lure related to song tabs, aiming to trick users into clicking the malicious links. 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=metallica%20master%20of%20puppets%20tabs%20pdf
    • http://files.sonoratradingpost.net/uploads/1/3/0/7/130775544/jenovoxumud.pdf
    • http://files.duanebrownlaw.com/uploads/1/3/1/4/131483253/2887604.pdf
    • http://files.kelleycarney.com/uploads/1/3/1/4/131406663/8890351.pdf
    • http://files.xofitnessstudio.com/uploads/1/3/1/6/131606694/kavomobazeveluko.pdf
    • http://files.thecooleygallery.com/uploads/1/3/1/3/131384286/donirijupaxon.pdf
    • http://files.thecooleygallery.com/uploads/1/3/1/3/1313
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/davunaxejapezuxipuwuwozom.pdf
    • https://cdn.shopify.com/s/files/1/0430/7435/5351/files/17171903301.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/83903979089.pdf
    • https://sukinuxan.files.wordpress.com/2020/07/kugoxizekutulafopekuwir.pdf
    • https://tuvivamitoti.files.wordpress.com/2020/07/diwowarenununasovusivolo.pdf
    • https://disetof.files.wordpress.com/2020/07/99994237666.pdf
    • https://wazejiwifo.files.wordpress.com/2020/06/nuzarimabininumokarokupuw.pdf
    • https://rifofapuw.files.wordpress.com/2020/07/tetarogiwawoja.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0811/files/82535038308.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/40641857590.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/pixawegujek.pdf
    • https://cdn.shopify.com/s/files/1/0433/1149/7366/files/23592225016.pdf
    • https://cdn.shopify.com/s/files/1/0429/1765/8780/files/goxitudigo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/53439193447.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_off000079b0.bin
52bab9a94644a49a3c4b30097965c32e5cf1acf85d6c55fe2490c90ae689aea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B0 5224 bytes
font_01_sfnt_off00008b6d.bin
5dff6dc8fd0b7b0990e1454d292ac1142fdd4d9e6ab392ef4510d0fe6465accf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6D 13360 bytes

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