Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72a37049dcaf857…

MALICIOUS

PDF

43.0 KB Created: 2020-08-22 11:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c521ad79d2ca234034f7806c09d70b78 SHA-1: 43f3f677f8103afaef154bd90ae6d67e60d5bb59 SHA-256: f72a37049dcaf857393d76d36f8fc3ca49fc23e8c466f1238d71cfcbef23ab57
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

This PDF document contains a large number of embedded links, many pointing to Shopify domains, but one critical link to `ttraff.cc` which is identified as a malicious redirector. The document body, though heavily obfuscated, contains the text "Forecast worksheet excel 2013" and the malicious URL, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates an attempt to lead the user to a malicious site.

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=forecast+worksheet+excel+2013
    • http://roxiz.outdoorsweddingceremoniesbymililaniwoods.com/uploads/1/3/1/3/131378816/6422795.pdf
    • https://cdn.shopify.com/s/files/1/0447/3297/3205/files/2586735537.pdf
    • https://cdn.shopify.com/s/files/1/0438/1684/5469/files/79839344125.pdf
    • https://cdn.shopify.com/s/files/1/0434/1239/0038/files/vivah_song_free_pagalworld._com.pdf
    • https://cdn.shopify.com/s/files/1/0432/0349/4043/files/sipivujefutap.pdf
    • https://cdn.shopify.com/s/files/1/0433/7506/7297/files/borbaad_movie_video_song_hd.pdf
    • https://cdn.shopify.com/s/files/1/0433/5586/5243/files/lopinofasu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5651/0616/files/72120519845.pdf
    • https://cdn.shopify.com/s/files/1/0428/9282/0647/files/liwenu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/26873998278.pdf
    • https://cdn.shopify.com/s/files/1/0429/6661/4175/files/wujuxuvuxamabokawarobu.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000650a.bin
b831565e93904d380e326c45a4d14ee6caa78dc1f128368811934ec048bc2366
pdf-font-stream PDF embedded font (sfnt) at offset 0x650A 5556 bytes
font_01_sfnt_off000077fc.bin
2fb5dc5e3e27123350153d871765f22f0aca40868180d0e02834cb98f54a91e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x77FC 11776 bytes