Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d287eb81151861…

MALICIOUS

PDF

52.0 KB Created: 2020-07-29 21:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cd3f4cdfd9b13509ff087471b56277b SHA-1: b2daa3530ae4f526104036d807653e5c3346e0f0 SHA-256: a3d287eb81151861cf77ae2bc5a83482f12478c243cfbddab84fccd142295957
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'Cbse result 2020 class 12 download pdf', suggesting a lure. The presence of numerous embedded URLs, many hosted on Shopify, indicates a link farm strategy to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=cbse+result+2020+class+12+download+pdf
    • http://files.clarevet.com/uploads/1/3/0/7/130738814/6baf8b64a8319.pdf
    • http://files.feat1stfilms.com/uploads/1/3/0/7/130738841/1530111.pdf
    • http://files.lamodastylist.com/uploads/1/3/0/9/130969408/rimofewukuzuba_nurapap_tizavedad_zawuzidixav.pdf
    • http://files.tllafleur.com/uploads/1/3/0/7/130740462/93746.pdf
    • http://files.starkeyspoint.com/uploads/1/3/1/4/131437881/posofaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/32494649318.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6599/files/23483292079.pdf
    • https://cdn.shopify.com/s/files/1/0434/8870/6717/files/latatumagudupajelenu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/76859312434.pdf
    • https://cdn.shopify.com/s/files/1/0433/2978/1918/files/xajimejoduvirexe.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6806/files/13861189394.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/momotega.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/25839213570.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/82312402140.pdf
    • https://cdn.shopify.com/s/files/1/0430/7917/2257/files/81212779175.pdf
    • https://cdn.shopify.com/s/files/1/0427/8494/8380/files/rivadudizomelopemede.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_off000081ad.bin
b90cd1c694d7784081d50f97bf02a0177d8c5b47686d81e1b815788b49129c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81AD 5564 bytes
font_01_sfnt_off000094ba.bin
e6eaf407c0336e298c698b4ec868a05a7b484cf7a5f8eef979fcb08f61a73392		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94BA 14328 bytes

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