Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87e69ae045b2dd2…

MALICIOUS

PDF

42.5 KB Created: 2020-08-02 15:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1a4883722c2e7a994f52b907060a8d9 SHA-1: fa2e89766ad757d8238e343f7bfca925dd72d97d SHA-256: a87e69ae045b2dd206938f61d6a0f30776f0a3a830aaef1810a447be2fb3906d
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to an English-Spanish dictionary and the malicious URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to drive traffic to the redirector. 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=english+spanish+dictionary+pdf
    • http://files.onecreativechoice.com/uploads/1/3/1/1/131164117/zemema-tejat-vokoxo-gewosuxuwata.pdf
    • http://files.abbywendy.co.nz/uploads/1/3/1/4/131452870/8148650.pdf
    • http://files.omanroadshow.com/uploads/1/3/1/3/131398143/ed373fde.pdf
    • http://files.fieldofdreamsrc.com/uploads/1/3/0/9/130969562/3579707.pdf
    • http://files.mhwclub.com/uploads/1/3/1/3/131383754/4346212106b1.pdf
    • https://cdn.shopify.com/s/files/1/0437/8004/6997/files/monumaxupaposajef.pdf
    • https://cdn.shopify.com/s/files/1/0431/5509/5708/files/88588162596.pdf
    • https://cdn.shopify.com/s/files/1/0434/7861/4168/files/mivukeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/13522739095.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/31979118391.pdf
    • https://cdn.shopify.com/s/files/1/0436/9534/1723/files/51920616841.pdf
    • https://cdn.shopify.com/s/files/1/0432/7473/1685/files/91372269470.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4637/files/docker_run_interactive.pdf
    • https://cdn.shopify.com/s/files/1/0437/0336/9878/files/zerotitasi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9902/9655/files/46288355661.pdf
    • https://cdn.shopify.com/s/files/1/0435/4949/1359/files/98117091139.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_off00006832.bin
2b2de4acde518dd87e1f628e8f26271852efaa3b02b43b184484012f4108322a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6832 5476 bytes
font_01_sfnt_off00007adb.bin
b2639f2e14a31f46f53b277ffdacc299a8a157a5c8e9764dc265e9827c9bec84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ADB 10076 bytes

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