Malicious PDF — malware analysis report

Static analysis result for SHA-256 619b7c14a87ac672…

MALICIOUS

PDF

41.7 KB Created: 2020-08-08 22:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11947ecb4a3bb704f2922c9f6dd1ffef SHA-1: 9a81b14dc966d4b8002712ebd3668789a00d85f9 SHA-256: 619b7c14a87ac672244429570cfb1e1eaf398f466cc68cb0d488ab27abd06e02
202 Risk Score

Malware Insights

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

The PDF contains a critical heuristic indicating it links to malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=adobe+pdf+editor+free+online`. Additionally, it exhibits characteristics of a PDF link farm and uses social engineering lures like a 'download button' and a 'browser extension installation lure'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=adobe+pdf+editor+free+online
    • http://files.bettysmakingmusic.com/uploads/1/3/0/9/130970022/wexefir.pdf
    • http://files.gabcmemphis.org/uploads/1/3/2/6/132682990/9079200.pdf
    • http://files.bloomingfulbirths.co.uk/uploads/1/3/2/6/132695351/diwaraxaxo-nopewalaval-dagekagano-gulamurosem.pdf
    • http://files.rudymareelphotography.com/uploads/1/3/1/1/131164067/2008146.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/nepokilol.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7349/files/26661778301.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/molijetavoxemekox.pdf
    • https://cdn.shopify.com/s/files/1/0435/0718/7872/files/auditory_discrimination_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87664315042.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/ragewafimatoli.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1142/files/93377041905.pdf
    • https://cdn.shopify.com/s/files/1/0434/2752/8871/files/acomaf_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/food_wars_nhentai.pdf
    • https://cdn.shopify.com/s/files/1/0434/4872/9767/files/9250069108.pdf
    • https://cdn.shopify.com/s/files/1/0435/0889/1807/files/22936367247.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_off0000668f.bin
ef48cdf4622366e3df41765d3f405a8c5c8fe03515cdafbecca8d2fddf9cfa4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x668F 4776 bytes
font_01_sfnt_off000076db.bin
1c14b387ff47ab25f9ce27ecaabd545df21eb878af5c8fed789667d030dabc59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76DB 10444 bytes

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