Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b2e4e75be76b0a…

MALICIOUS

PDF

36.5 KB Created: 2020-08-04 11:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8308568b6cd434fadf882e0357d8bca SHA-1: 506b1776c8a67efd8e96ca0bda4c4104287cc4a8 SHA-256: 66b2e4e75be76b0a92451d6ee72c99884b968c7d1d613e15ed2efb6527809a68
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 external PDF files, indicating a link farm or SEO poisoning attempt. One of the primary links redirects to `ttraff.com`, a known malicious redirector. The document body, though partially corrupted, contains text related to exam papers, suggesting 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.com/pify?keyword=cambridge+o+level+english+language+past+exam+papers+pdf
    • http://files.drogmi.org/uploads/1/3/0/8/130813667/1211782.pdf
    • http://files.gjohnstone.net/uploads/1/3/1/6/131637043/6103523.pdf
    • http://files.my-early-morning-thoughts.com/uploads/1/3/1/6/131606109/1ab6aacc70de7ce.pdf
    • http://files.daviestreeservicesltd.co.uk/uploads/1/3/0/8/130814280/kamipabotu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1026/9085/files/titel.pdf
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/50250792776.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.pdf
    • https://cdn.shopify.com/s/files/1/0432/3183/8368/files/warcraft_the_roleplaying_game.pdf
    • https://cdn.shopify.com/s/files/1/0430/5282/6773/files/60870755673.pdf
    • https://cdn.shopify.com/s/files/1/0437/4256/0407/files/33814553940.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35209966956.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/aliens_colonial_marines_technical_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/4169/2567/files/80786492369.pdf
    • https://cdn.shopify.com/s/files/1/0429/8617/6665/files/87769351191.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_off00004e5b.bin
dcd82f531a6ef3f647f4bb11545876c0daf1dc3f6a9003c7bcc3ba8426360fa9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E5B 5628 bytes
font_01_sfnt_off00006153.bin
a1fc51118ce327655fcda74ee9397e55c79f870854edb59640fa2e0e36be9181
pdf-font-stream PDF embedded font (sfnt) at offset 0x6153 10436 bytes