Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f6ddf29c634079…

MALICIOUS

PDF

42.0 KB Created: 2020-08-31 06:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97e861968c507dc4162d23b813b82bb8 SHA-1: 4ac45f53c7a7d3ece4a61866be6dbd90c6b86588 SHA-256: e4f6ddf29c6340796c9e27fecf19c0516e9ff9deb7832132886e0ffa0a5dfd7c
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with multiple links pointing to static.usrfiles.com and cdn.shopify.com, likely for SEO poisoning. A critical heuristic identified a malicious redirector link to 'https://ttraff.cc/wix?keyword=hacknet+security+tracer', suggesting the document is designed to lure users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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/wix?keyword=hacknet+security+tracer
    • https://static.usrfiles.com/ugd/dfb5f8_f9b5d1cecad34dc9810849ca01fa6795.pdf
    • https://static.usrfiles.com/ugd/b8c837_b199982e9424494faa47077ed883b1b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b7033b76afb4be58cc8b6af50ca52f8.pdf
    • https://static.usrfiles.com/ugd/5be868_6c5c6d9d16064cbba0f521c6ebb0afbe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/6581741250.pdf
    • https://cdn.shopify.com/s/files/1/0432/0624/6557/files/website_layout_template_example.pdf
    • https://cdn.shopify.com/s/files/1/0437/7490/2423/files/ubuntu_14._04_iso_and_usb-_installer.pdf
    • https://cdn.shopify.com/s/files/1/0447/2127/5033/files/oxford_english_dictionary_ebook_download.pdf
    • https://static.usrfiles.com/ugd/451461_6a28342ded1f4bac89667e19a0fa175f.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c56ff02bb8747a39c6d409075c3bdb5.pdf
    • https://static.usrfiles.com/ugd/fbccce_36fd35a91f9b4c9c843c1b292e584976.pdf
    • https://static.usrfiles.com/ugd/ad2ade_918399ed978b4189995cc8f286c038eb.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_off00005a7d.bin
ec731872f2d4b26300188a962cde64ace74bb0d135abb11ecc91c90711c16e03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A7D 4660 bytes
font_01_sfnt_off00006a5c.bin
0e7bdcf3cc0142345d10cee2a7cc838a6a42981c4382ff81c58dc00608177cdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5C 10312 bytes
font_02_sfnt_off00008d7d.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D7D 4324 bytes

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