Malicious PDF — malware analysis report

Static analysis result for SHA-256 6351435924e6dd4c…

MALICIOUS

PDF

44.6 KB Created: 2020-07-28 15:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 772b60654db33d7b5af2f4c76ecb6ab8 SHA-1: 0fe373c8de0a73d1285c62c29bab1325586cc1be SHA-256: 6351435924e6dd4ce58bbbd7cd0ff0e50007a80740f122b8a27e41832b6e6a0a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to manipulate search engine results or distribute further payloads. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic are strong indicators of malicious intent.

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=burnley+vs+liverpool+1-+3
    • http://files.mohammedsabrin.org/uploads/1/3/1/3/131379321/3280424.pdf
    • http://files.sweetthingscoleshill.co.uk/uploads/1/3/0/8/130813777/sujexeremumunexodini.pdf
    • http://files.osborneranch.com/uploads/1/3/0/9/130968960/rupetom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7196/2265/files/raduwepevegituruvob.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1384/files/53845342356.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/kexupo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0052/9049/files/72171230065.pdf
    • https://cdn.shopify.com/s/files/1/0431/4857/4884/files/vuvexamuvoladovekot.pdf
    • https://cdn.shopify.com/s/files/1/0428/1021/2519/files/83665895881.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6344/files/8453386169.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/50558217757.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8249/files/85931071544.pdf
    • https://cdn.shopify.com/s/files/1/0429/4171/0499/files/64984414380.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42479515564.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7539/files/vofatifapetagume.pdf
    • https://cdn.shopify.com/s/files/1/0433/3774/4534/files/jovosedozigofelu.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_off00007160.bin
8da924ff50ae06ddd513af8bd4678e88ad86a6f5417fa50c0de1c3fb06020d80
pdf-font-stream PDF embedded font (sfnt) at offset 0x7160 4864 bytes
font_01_sfnt_off0000820a.bin
f9049c923e188014a7b408009699e25d85295b6671513ccbf246e0c51772e221
pdf-font-stream PDF embedded font (sfnt) at offset 0x820A 10420 bytes