Malicious PDF — malware analysis report

Static analysis result for SHA-256 543676332cf1f44c…

MALICIOUS

PDF

59.8 KB Created: 2020-08-24 23:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b50c4e9c3ca610096ea1157ebc844797 SHA-1: 550cd8c8b111a74b92f37a5f00b68f3ee5564710 SHA-256: 543676332cf1f44c4ec617a8caa59d2fc7dd0472951d366552e602535b576bdb
150 Risk Score

Malware Insights

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

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 a URL that matches the redirector. This suggests the primary purpose is to redirect users to malicious sites, likely for phishing or malware delivery. No scripts were extracted, and the document body's content is not directly readable, but the link farm and redirector are strong indicators of malicious intent.

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.cc/pify?keyword=aarti+song++pagalworld
    • http://wixanab.howtoinvestinstocks.com/uploads/1/3/1/4/131437402/jidoto-keseduwikul-tosuzagomaxoj-raboxakameva.pdf
    • http://deruk.cherylnewmanmd.com/uploads/1/3/1/3/131384714/sugizixidowegasasas.pdf
    • http://files.hello-baby-toys.com/uploads/1/3/1/4/131453807/4352687.pdf
    • http://files.iananthonycoleman.com/uploads/1/3/0/7/130776718/9342694.pdf
    • https://cdn.shopify.com/s/files/1/0447/9824/7078/files/antivirus_android_tv.pdf
    • https://cdn.shopify.com/s/files/1/0433/6379/5094/files/music_player_apk4fun.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1717/files/vidofe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0596/8537/files/vepit.pdf
    • https://cdn.shopify.com/s/files/1/0434/3093/6733/files/67300886009.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/zowipevezenaxowofofivuz.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/anestesia_regional_con_ecografia.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/11772386029.pdf
    • https://cdn.shopify.com/s/files/1/0431/5679/9647/files/17852914343.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_off0000a6d1.bin
0848cd315cb04b50f03c036890cf4a449385ab3f4141dc310b76bf2731f7b5a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6D1 5208 bytes
font_01_sfnt_off0000b8a1.bin
1d129701753efa8eea04e8b6f71b1c2ae07048cc5287d83ee6f5d0d3d7bc5061		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A1 13640 bytes

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