Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eef4e452b4ee009…

MALICIOUS

PDF

70.5 KB Created: 2020-08-16 20:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b54a9dde11b6c8d92d13ef9dd8e7713 SHA-1: b8eee20317c7d89ca87f6a8b61b144d6a51c8859 SHA-256: 8eef4e452b4ee009905c281c8f9674ef1ed710b75d88a18354e050bae0860cfd
150 Risk Score

Malware Insights

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

This PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=chinese+lunar+calendar+2020+pdf'. The document body also contains this URL and numerous other links to PDF files hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The primary malicious URL is likely used to redirect the user to a malicious site or download further payloads. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.cc/pify?keyword=chinese+lunar+calendar+2020+pdf
    • http://rivusiwev.tastefulvoyages.com/uploads/1/3/1/4/131437502/1698088.pdf
    • http://files.balloontwistersdcvamd.com/uploads/1/3/0/9/130969375/gipagazovupibiz_tolokaduwimola.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/79931992559.pdf
    • https://cdn.shopify.com/s/files/1/0431/9028/8535/files/wozamokolir.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6396/files/voxonoxasewab.pdf
    • https://cdn.shopify.com/s/files/1/0427/9471/3244/files/android_map_network_drive_as_local_folder.pdf
    • https://cdn.shopify.com/s/files/1/0430/5905/2706/files/14952424032.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5744/files/58694538188.pdf
    • https://cdn.shopify.com/s/files/1/0450/6897/6291/files/ferilenajirulig.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00007143.bin
b5eb303e7d9c2b7e2513f06006163b85e3cfc3bed7d4a0ce31e11bb397a651ea		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7143 25404 bytes
font_01_sfnt_off0000c00d.bin
cec2521e2d6aaf199ddddc1f56b7445d826e23512df310cf9d226aaab6d11fd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC00D 5232 bytes
font_02_sfnt_off0000d1bb.bin
512790654f1c0381fa62381fb8fa6302552c061109634e58c6a5549d59488d61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BB 14524 bytes
font_03_sfnt_off0000fda8.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA8 4324 bytes

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