Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa8107515b77988…

MALICIOUS

PDF

41.1 KB Created: 2020-08-17 10:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 051cf6ed92238b77ddb6c7be4152c15b SHA-1: a4013e4ba51d15ccaf631ef41ae7ce0e7615ac4b SHA-256: 1aa8107515b7798853392b243e501ea4560a66bb786c512e01ac4b392e91376c
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=adverb+placement+exercises+pdf', suggesting a lure to a site distributing malicious content. The presence of a link farm and the ML classifier's high confidence score further support its malicious nature. No scripts were extracted from this sample.

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/pify?keyword=adverb+placement+exercises+pdf
    • http://files.cutofnova.org/uploads/1/3/1/3/131379761/xegukuwusak_fepivavamere_wasajisive.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8349/files/wakaxukixedunibiv.pdf
    • https://cdn.shopify.com/s/files/1/0441/3823/4008/files/12379664864.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/mexewefemalas.pdf
    • https://cdn.shopify.com/s/files/1/0439/0433/6027/files/a_alphabet_wallpaper_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/godsfall_world_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/0866/2440/files/bloodborne_pathogens_exposure_control_plan.pdf
    • https://cdn.shopify.com/s/files/1/0433/7106/9594/files/hillsong_united_songs_lyrics_and_chords.pdf
    • https://cdn.shopify.com/s/files/1/0430/4879/6309/files/jepovo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0794/9475/files/nagudelubidagidib.pdf
    • https://cdn.shopify.com/s/files/1/0434/5036/8152/files/53202310777.pdf
    • https://cdn.shopify.com/s/files/1/0441/3099/2280/files/gevoxadogisopepesabizak.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/74259682432.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_off000062ba.bin
1e025acd1415b0164c984c7b560a883c9547d2cb7a0a6c3fd650bbed854b6f8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62BA 5560 bytes
font_01_sfnt_off00007588.bin
008dc93b56ea6c399f201d1850aa4213d7b210ed481edd57cc88c7c024f72e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7588 10100 bytes

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