Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd874a051e5d7fe3…

MALICIOUS

PDF

40.5 KB Created: 2020-08-31 22:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae37f2c53a3fdaeb0a9eca0165cdf96c SHA-1: 2ca6425fbd468600af5b98dad122acb0496ccbee SHA-256: fd874a051e5d7fe352134bdfcc1209718e34faba7b5f881e5ccb1459693781b6
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains the same suspicious URL found in the heuristics. The presence of a large number of external links suggests an attempt to manipulate search engine results or direct users to malicious sites.

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.ru/wix?keyword=fishtrap+lake+mn+fishing+report+2018
    • https://static.usrfiles.com/ugd/b8c837_354a95618d324d27ae6063bcd34cfe0b.pdf
    • https://static.usrfiles.com/ugd/b8c837_5fdb7d79bdff4ada8e030df7de01ffe3.pdf
    • https://static.usrfiles.com/ugd/0789d5_12ceec1bbd1f4bb2bf242be3ca8e5980.pdf
    • https://static.usrfiles.com/ugd/7c30af_e84bbfdc04ae4bdda8d827a69442762e.pdf
    • https://static.usrfiles.com/ugd/1a89c8_1eb8e0b324c245d4ac36144aee9cce71.pdf
    • https://cdn.shopify.com/s/files/1/0439/9199/0430/files/ccna_security_interview_questions.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_2dd51d284c914e5db96016191d4e17bf.pdf
    • https://static.usrfiles.com/ugd/d775a9_e9fd05c719424219a3b4c7ca001262db.pdf
    • https://static.usrfiles.com/ugd/0d9a50_2c24cf4a5c604c14bcbd0c71573e814b.pdf
    • https://static.usrfiles.com/ugd/a4d998_f9f05a5e484b4a6fa4585308d8292280.pdf
    • https://static.usrfiles.com/ugd/bfbc46_e83ec796378b4ec1b77ac9600c6f7ce1.pdf
    • https://static.usrfiles.com/ugd/0d089b_ea72037496544936a00a0d94593df890.pdf
    • https://static.usrfiles.com/ugd/912de2_07694ad832f44ed6b288adeb0dd0f599.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe89ea9fbae94729b8945e3964f4c58b.pdf
    • https://static.usrfiles.com/ugd/b8c837_133d4397d13245c8aac7a98d672075fb.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_off00005d7c.bin
bcb9884e90417c04536b0193824628dba0b206009cf2231ae51ed14d95919f01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7C 5856 bytes
font_01_sfnt_off00007149.bin
cbbf5cdac21068cb1073970d013448000ed115d9090eed9b6d3b46940a2b8d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7149 10576 bytes

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