Malicious PDF — malware analysis report

Static analysis result for SHA-256 698ea7fc1a90c7f5…

MALICIOUS

PDF

43.2 KB Created: 2020-07-13 21:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92534311a0d16ea01e32bcc0b1534028 SHA-1: 14a176e2c9ae6b583c504d0a6bf124e441110e54 SHA-256: 698ea7fc1a90c7f5920ddf2307b12ec31a66a3258cdd558445f5966129945c0b
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to SEO-optimized PDF hosting sites, suggesting a link farm or content-scraping operation. One critical heuristic identified a link to known malicious redirector infrastructure, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains text related to 'cyber olympiad sample papers', indicating a lure to entice users to click the malicious links.

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/wb?keyword=national%20cyber%20olympiad%20sample%20papers%20for%20class%206%20pdf
    • http://files.saban-kazim.com/uploads/1/3/1/8/131871644/01cf269ea.pdf
    • http://files.secondtonunframery.org/uploads/1/3/2/6/132681482/5800604.pdf
    • http://files.whistlingfrogresort.com/uploads/1/3/2/6/132681002/masaberilanimubaloji.pdf
    • http://files.leidenmanifesto.org/uploads/1/3/0/8/130874237/banuxamamefinu_kozosufepeg_wijuzumu.pdf
    • http://files.lavenderlanemi.com/uploads/1/3/1/4/131453934/01379b0daec873.pdf
    • http://files.dkdynamite1.com/uploads/1/3/1/4/131407263/kojizim.pdf
    • http://files.livignoexclusive.com/uploads/1/3/0/7/130738700/338839.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://surirupuje.files.wordpress.com/2020/07/dugowinedavisajage.pdf
    • https://depitexexu.files.wordpress.com/2020/07/tibed.pdf
    • https://tolefeguxi.files.wordpress.com/2020/06/kezumebabelutilugit.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/giloxom.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/fidezorozikonabaduzanipe.pdf
    • https://cdn.shopify.com/s/files/1/0433/3774/4534/files/gobovuvadanudena.pdf
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/xixibapugizivulutetomas.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/9202199494.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/18853405402.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21154843933.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_off00006b3d.bin
18646ae0e6b04d335b51f7833a67cb7d9af9ad220b0a7454e0d801c3b9fe8b99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3D 5456 bytes
font_01_sfnt_off00007dad.bin
48da1c0762f370aec881ab55b9040c86bbc4124ad653d95f560825a0725a95f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAD 9852 bytes

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