Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd3eeaa0d6e7b07…

MALICIOUS

PDF

37.7 KB Created: 2020-08-01 16:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae055efbd6144d29bc010d98b037c2b2 SHA-1: e658e37267c3e65abd84e19b14bb8f9e0bd2d2ca SHA-256: 9bd3eeaa0d6e7b078e44537d11b09d9af7b861c62a9b3ce14b77b628eb7cb623
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'cell phone ringer amplifier' and the malicious URL. This suggests a phishing or malware delivery attempt. The ML classifier also strongly indicated maliciousness.

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=cell+phone+ringer+amplifier
    • http://files.madmarkfarms.com/uploads/1/3/1/1/131163841/8430158.pdf
    • http://files.communitychurchsheppey.com/uploads/1/3/0/8/130874318/49948dc.pdf
    • http://files.whereineurope.net/uploads/1/3/2/6/132681979/2580828.pdf
    • https://cdn.shopify.com/s/files/1/0431/2698/0765/files/40379806053.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/bisalojebo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lagikemirulufuwetore.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/robuxisezepisiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/5598/9404/files/kuzurenabojenudalamikuja.pdf
    • https://cdn.shopify.com/s/files/1/0437/4760/6679/files/kopopazetumoxogabesulewe.pdf
    • https://cdn.shopify.com/s/files/1/0437/7329/6801/files/how_to_write_github_readme.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/61138543422.pdf
    • https://cdn.shopify.com/s/files/1/0437/5491/3950/files/malusowutusiwukusosabum.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/zefazaxufotulapu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4026/8711/files/63359740577.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0136/files/57343343447.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_off000055b9.bin
762e5bf34f680bf26150348e72d26553bce3414bb77a67d23fea8761041f15c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55B9 5040 bytes
font_01_sfnt_off000066b6.bin
0881d9083e6f50039c64d744e61911ba06104889374dc7297cce0077e3c2a5ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B6 10276 bytes

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