Malicious PDF — malware analysis report

Static analysis result for SHA-256 163ff99adef462e9…

MALICIOUS

PDF

44.1 KB Created: 2020-08-02 20:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b74602f6a9b6ed831ab29782eb787832 SHA-1: 456518cd7fce850ffc1c9521149922076d61080b SHA-256: 163ff99adef462e995adcd5bba866a432e25f8875dbc62ddac7806a20a35e7a3
194 Risk Score

Malware Insights

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

The PDF contains a lure to copy/paste content into a shell, indicating an attempt to trick the user into executing commands. It also hosts a large number of external PDF links, many of which point to potentially malicious redirectors like 'ttraff.com'. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious document.

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=mac+command+line+cheat+sheet
    • http://files.ndmedcan.com/uploads/1/3/2/3/132303189/4507192.pdf
    • http://files.calliecolifecoaching.com/uploads/1/3/2/7/132740375/nawafej.pdf
    • http://files.eddiebyun.com/uploads/1/3/1/4/131437216/4879382.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9177/8965/files/parebemovek.pdf
    • https://cdn.shopify.com/s/files/1/0431/0401/0389/files/8688948768.pdf
    • https://cdn.shopify.com/s/files/1/0440/8007/0821/files/likojulowazizagi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2103/files/vafoguwetafuginokapovego.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/78760403757.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kenawuvotijogajutimev.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/busebabevixupuwiseviwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5281/7832/files/72028688155.pdf
    • https://cdn.shopify.com/s/files/1/0433/7152/8344/files/zegilip.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9817/files/wozaz.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_off000065b7.bin
6b8cdc5875f8adc2f252c993bbc0a7fc0d47b9ea7e05887b75f914e35903a3ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x65B7 5088 bytes
font_01_sfnt_off000076e4.bin
ae87063dbaa60772d9f27a0e74a2dbc34bc69dc72992fe0fbc44f809f28ea296
pdf-font-stream PDF embedded font (sfnt) at offset 0x76E4 14336 bytes