Malicious PDF — malware analysis report

Static analysis result for SHA-256 7911a249473b454a…

MALICIOUS

PDF

43.0 KB Created: 2020-08-19 21:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e1dba6ce4d98166c8c1ce4ee8e21e02 SHA-1: dfe177c91765d6dfa2e9d5cbf644c807bf5703fa SHA-256: 7911a249473b454a01fe310121181bd78ff83b0a5377f95bfd491001258249f5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or redirection strategy. Crucially, it includes a lure to copy/paste content into a shell, indicating an attempt to trick the user into executing commands. The presence of a malicious redirector URL further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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=gsheets+python+api
    • http://wiroduk.elizafreed.com/uploads/1/3/2/3/132303382/gavoxusakudoku.pdf
    • http://safimote.rpnsottawa.com/uploads/1/3/2/8/132815094/dezuf-tusakog-sumedanup.pdf
    • http://files.victoriaesquivel.com/uploads/1/3/2/7/132740488/ralaposajodajazi.pdf
    • http://files.gloryb2g.com/uploads/1/3/2/7/132740249/varezef-fuxim-lupoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/sijenab.pdf
    • https://cdn.shopify.com/s/files/1/0436/0008/5160/files/tetafurunorevutusexiwave.pdf
    • https://cdn.shopify.com/s/files/1/0434/6177/1430/files/vurab.pdf
    • https://cdn.shopify.com/s/files/1/0434/2117/1864/files/catalogo_de_abrigos_price_shoes_2020.pdf
    • https://cdn.shopify.com/s/files/1/0440/8829/5576/files/92800636794.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27247465441.pdf
    • https://cdn.shopify.com/s/files/1/0432/4248/7963/files/320359916.pdf
    • https://cdn.shopify.com/s/files/1/0435/5047/4399/files/paracetamol_mechanism_of_action_applications_and_safety_concern.pdf
    • https://cdn.shopify.com/s/files/1/0429/3473/0911/files/jogabifowuzavedisibiti.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d04.bin
686720666bc24ce254911959d5b011c9e62e6bb5fbb1f27e70d068929e6eb437		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D04 4700 bytes
font_01_sfnt_off00006cfd.bin
655a446f7b3c587a1f132dbeb6564ee26555e7f757955645fae1cc801d91b78c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFD 10712 bytes
font_02_sfnt_off000091a4.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91A4 4324 bytes

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