Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c64bec2a7a5a9f…

MALICIOUS

PDF

43.8 KB Created: 2020-08-09 18:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b48f1dadaa00e033a1b0e95c53f33fd SHA-1: 04d3de65434a1fec353ed1ba16168fb4fb4d239a SHA-256: 01c64bec2a7a5a9f41db23843b94ae2bb0226651511ad9f62107859d064dedd2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The ML classifier also strongly indicated maliciousness. The primary attack pattern observed is the use of a link farm to distribute malicious URLs, likely to lure users to phishing or malware download sites.

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.cc/pify?keyword=ballad+of+the+green+berets+pdf
    • http://files.kristenkellymahoney.com/uploads/1/3/2/6/132680974/xemul-towizunedugi-rawet-kulixajol.pdf
    • http://files.christypaw.com/uploads/1/3/0/8/130814788/6881534.pdf
    • http://files.guybuncecomposer.co.uk/uploads/1/3/1/3/131380539/c37e6f29.pdf
    • http://files.pokerwithjimmy.com/uploads/1/3/0/7/130776850/72786.pdf
    • http://files.poodywoody.nl/uploads/1/3/0/9/130969545/7e5cb9473a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/mikik.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/pathophysiology_of_hepatitis_c.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/64523541679.pdf
    • https://cdn.shopify.com/s/files/1/0435/0840/0280/files/download_cube_world.pdf
    • https://cdn.shopify.com/s/files/1/0431/9395/8560/files/persian_to_english_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/217189196.pdf
    • https://cdn.shopify.com/s/files/1/0432/2518/6466/files/50956287400.pdf
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/76013039737.pdf
    • https://cdn.shopify.com/s/files/1/0451/7563/6119/files/simplified_and_amplified_book_keeping_and_accounting.pdf
    • https://cdn.shopify.com/s/files/1/0435/7623/0047/files/49884714176.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/69574763235.pdf
    • https://cdn.shopify.com/s/files/1/0433/0848/2710/files/10283633933.pdf
    • https://cdn.shopify.com/s/files/1/0430/9028/0609/files/bijitularezanatinesopi.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c90.bin
7708c65b9586612c6a8e8816fdc68669d264403337915233a437d48f8e6b7c69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C90 5492 bytes
font_01_sfnt_off00007f33.bin
636f7e08fc87d5b41bbc56b15f049b269a3967f19eee04895fa2ebb22c4d84ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F33 10352 bytes

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