Malicious PDF — malware analysis report

Static analysis result for SHA-256 122c8e5d07cbe09e…

MALICIOUS

PDF

40.4 KB Created: 2020-08-02 07:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cbb9d0c7ce966393ef873d43e5bff31 SHA-1: 48e625b879b2825d50d7fbb3eef4e5572ba607a0 SHA-256: 122c8e5d07cbe09e3869f9b6fc3d21e68721bb499aa9ab16d4b094763eba0aaa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'Brooklyn 99 torrent' and a URL that appears to be part of a link farm designed to distribute malicious content. The ML classifier also 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.cc/pify?keyword=brooklyn+99+torrent
    • http://files.hokansonscustomrods.com/uploads/1/3/1/1/131164011/febujod-setesupe-barasamojisebom-xagepomuzom.pdf
    • http://files.lifeofastreetdog.com/uploads/1/3/0/7/130740011/8496827.pdf
    • http://files.viridesscents.com/uploads/1/3/2/7/132712483/biwuvoxi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tizerosotusalasebix.pdf
    • https://cdn.shopify.com/s/files/1/0434/3391/8616/files/35095214854.pdf
    • https://cdn.shopify.com/s/files/1/0433/9243/4326/files/ginudogaludelidisawawi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5351/files/xisimulisudo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/30472804843.pdf
    • https://cdn.shopify.com/s/files/1/0433/2873/3352/files/66595688023.pdf
    • https://cdn.shopify.com/s/files/1/0432/0005/3408/files/79949811232.pdf
    • https://cdn.shopify.com/s/files/1/0433/7994/9718/files/97191955911.pdf
    • https://cdn.shopify.com/s/files/1/0427/9618/7815/files/largest_cities_in_us.pdf
    • https://cdn.shopify.com/s/files/1/0434/1740/3559/files/3388535792.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/85069914517.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/55719623774.pdf
    • https://cdn.shopify.com/s/files/1/0429/7555/9829/files/74133443482.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3842/files/41927228069.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_off00005f87.bin
f620b615fb5946ff57a0fcf9891275551f2657346d9722993af7788e27802340
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F87 4660 bytes
font_01_sfnt_off00006f84.bin
575ec597daf70bca4112ea4aad9feb713ce16e4b3e4885192938d4e23190292b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F84 11056 bytes