Malicious PDF — malware analysis report

Static analysis result for SHA-256 861f53496872c7d2…

MALICIOUS

PDF

44.5 KB Created: 2020-08-21 00:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a9d6c7222e84480f9b287ed2f0ec3bc SHA-1: 276ceb561c13c46b49420ee79e6b7dc28073a32a SHA-256: 861f53496872c7d2b3446b56d873999aeb95dd23355c141f89d3e3ba66570bc5
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a 'quiz' lure, and the presence of numerous external PDF links further indicates a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=impossible+quiz+app+answer+32
    • http://files.kamariawilliams.com/uploads/1/3/1/4/131453109/sejajuzatuwef_seguxawex.pdf
    • http://files.boondhs.com/uploads/1/3/0/8/130874012/34dcba95a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4381/4560/files/58299589391.pdf
    • https://cdn.shopify.com/s/files/1/0438/6488/3355/files/xijon.pdf
    • https://cdn.shopify.com/s/files/1/0431/2976/6039/files/62418761528.pdf
    • https://cdn.shopify.com/s/files/1/0434/9837/3285/files/95617948359.pdf
    • https://cdn.shopify.com/s/files/1/0431/2009/9488/files/5190001675.pdf
    • https://cdn.shopify.com/s/files/1/0432/0706/5760/files/mapewaligojegirebumof.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/81669760589.pdf
    • https://cdn.shopify.com/s/files/1/0437/8106/2813/files/free_destination_wedding_budget_template.pdf
    • https://cdn.shopify.com/s/files/1/0436/6660/4182/files/nakama_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/2800/4507/files/turugesuratirulija.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_off00006fb1.bin
5ea86c66001e3c2ab3607913702c15851d5092da580934fe3cde16322350b85b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB1 5608 bytes
font_01_sfnt_off000082bd.bin
7abb64f36b7b04f9d67b701b5b024b97ee047a04f363be01ea2e393f0112381c
pdf-font-stream PDF embedded font (sfnt) at offset 0x82BD 10296 bytes