Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87be690308451ea…

MALICIOUS

PDF

45.6 KB Created: 2020-08-06 15:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6bcd7f35bceba0dcb29c04a30468d2f SHA-1: f845e2483deb5db443f4781f1d7d88efd50914c8 SHA-256: b87be690308451eab64b9c6ce43dd3047b9a79dd2a13d8694264779825d525bc
170 Risk Score

Malware Insights

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

The PDF contains a lure to download an 'answer sheet' which, upon inspection, contains numerous links. One critical heuristic identifies a malicious redirector link pointing to 'ttraff.com'. Another heuristic flags a large number of external PDF links, suggesting a link farm. The document body and heuristics indicate a social engineering attempt to trick the user into clicking a link, likely leading to a malicious download or exploit.

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.
  • 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
  • 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=answer+sheet+pdf+1+50
    • http://files.shelleypearsonwrites.com/uploads/1/3/0/7/130775786/kokizererurerom-wanemakedilex-nozorenon.pdf
    • http://files.thatsadormable.com/uploads/1/3/0/8/130874432/donaninano.pdf
    • http://files.bubbleytrinkets.com/uploads/1/3/0/7/130738823/2e674f4ea19c4e.pdf
    • http://files.domowilliamsburg.com/uploads/1/3/0/8/130874658/kakibofaxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/0212/6751/files/24980436077.pdf
    • https://cdn.shopify.com/s/files/1/0438/4918/7493/files/32462563553.pdf
    • https://cdn.shopify.com/s/files/1/0448/2940/9442/files/ectomorph_muscle_gain_workout.pdf
    • https://cdn.shopify.com/s/files/1/0432/8144/9126/files/zaraxuselopisunifa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4487/2090/files/59866661414.pdf
    • https://cdn.shopify.com/s/files/1/0434/1324/2005/files/99635681638.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/83162950838.pdf
    • https://cdn.shopify.com/s/files/1/0438/5135/0166/files/3252974554.pdf
    • https://cdn.shopify.com/s/files/1/0436/6853/7509/files/93458122752.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065e5.bin
00e674763d1339888aed7056e98cfc1df990d2da3e95ac3bcad0727d86b5f12a
pdf-font-stream PDF embedded font (sfnt) at offset 0x65E5 4916 bytes
font_01_sfnt_off000076a7.bin
45ed0d20b338def8eddc11647ace95083edccacae58c48113407fc5e7b7f219e
pdf-font-stream PDF embedded font (sfnt) at offset 0x76A7 10960 bytes
font_02_sfnt_off00009c02.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C02 4324 bytes