Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab45cfbccf5d54e…

MALICIOUS

PDF

47.3 KB Created: 2020-08-08 19:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d3dcea4cb0a2970689378aeda3fef19 SHA-1: 4d10b97227309553120eb4e92e516efac3e7a9f8 SHA-256: fab45cfbccf5d54ed3a07f2788b720f11ca47f240497aa11b78cd26374226e7e
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm or SEO spamming technique. One critical heuristic identified a link to a known malicious redirector, `https://ttraff.ru/pify?keyword=exponents+with+negative+bases+worksheet+pdf`. The document body, though partially obfuscated, also contains this URL, suggesting the primary intent is to drive traffic to malicious infrastructure. No scripts were extracted from this sample.

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=exponents+with+negative+bases+worksheet+pdf
    • http://files.shophempsley.com/uploads/1/3/2/6/132681443/bagatezumokapa.pdf
    • http://files.shopburpee.org/uploads/1/3/1/4/131438829/5cde1b18.pdf
    • http://files.artbymadelinesmith.com/uploads/1/3/1/4/131454065/tokoxegududuz-nenetofajumena.pdf
    • http://files.threeyogachicks.com/uploads/1/3/2/6/132681513/4261354.pdf
    • https://cdn.shopify.com/s/files/1/0438/3670/2870/files/how_to_merge_files_mac.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/rejazezisetabaxaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/1617/5263/files/19741688395.pdf
    • https://cdn.shopify.com/s/files/1/0433/2696/3865/files/49584918510.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2857/files/11484666874.pdf
    • https://cdn.shopify.com/s/files/1/0431/1705/2053/files/81686108603.pdf
    • https://cdn.shopify.com/s/files/1/0437/2417/7557/files/donotafupuzamofumob.pdf
    • https://cdn.shopify.com/s/files/1/0439/2134/2619/files/pazanevip.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/senabepudifogekagavijekuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/5167/9893/files/kosufesugajajilemud.pdf
    • https://cdn.shopify.com/s/files/1/0432/2823/3885/files/gitemoduwarudasalel.pdf
    • https://cdn.shopify.com/s/files/1/0434/5806/8633/files/vidoxenosifivovisamuk.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_off000062b5.bin
5f5a409f7c219285524a6a165b8633f1a63580e0ffaadb7dc41c48a4428dac8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x62B5 5652 bytes
font_01_sfnt_off00007607.bin
c437cbec7c0c79704966b2701a81ce9befa6b99aec71bf3a7a091c15a9813a97
pdf-font-stream PDF embedded font (sfnt) at offset 0x7607 10660 bytes
font_02_sfnt_off00009a7e.bin
735145b4449eb7055ff6b4d40d3aa45f563fca0706c7c6ce5da58054ef6f4a5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A7E 16164 bytes