Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa439928440678a…

MALICIOUS

PDF

51.2 KB Created: 2020-08-02 18:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7537f3b472e98a75ce7b90f3960eafe SHA-1: 38ba8fd3cb08d07fe85adee614a701fa404806a9 SHA-256: 7aa439928440678a3237a051454ec7d16cafae830a8a9eabb149e73b6b004766
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=bulk+apperception+definition', which is flagged as malicious. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute malicious content through a network of seemingly benign documents.

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=bulk+apperception+definition
    • http://files.steedgroup.org/uploads/1/3/0/9/130969140/8343126.pdf
    • http://files.kresscinema.com/uploads/1/3/0/7/130775368/juzedivajilaket_sowakomigep_kemugilalalexu_rewonafilekuz.pdf
    • http://files.quadifyrc.com/uploads/1/3/1/8/131871705/jevokibekexaxowereb.pdf
    • https://cdn.shopify.com/s/files/1/0437/9875/7538/files/20328893372.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/mowokerinevoxudarewun.pdf
    • https://cdn.shopify.com/s/files/1/0433/2231/0811/files/50790462829.pdf
    • https://cdn.shopify.com/s/files/1/0428/2309/0343/files/sleeper_cell_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5005/files/26949580777.pdf
    • https://cdn.shopify.com/s/files/1/0440/7646/6328/files/bemigasobukazinopupiduzis.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2974/files/14734342893.pdf
    • https://cdn.shopify.com/s/files/1/0428/8384/2215/files/30946057804.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6290/files/22036786431.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/buguzejesupegumitage.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53978683100.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_off00008b37.bin
d69ff21bef9fc54c6c3f55cb194bcedf8c59ac8a6e6fb2eb1c90c7e7ade832ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B37 5084 bytes
font_01_sfnt_off00009c99.bin
02578539dcebc807536fa97f667cee3f306b3068e5510ce4a4d43b701ff281f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C99 10412 bytes

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