Malicious PDF — malware analysis report

Static analysis result for SHA-256 2201660bdabb1bc7…

MALICIOUS

PDF

60.9 KB Created: 2020-08-02 22:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1e741004a07c4740c1a093a3c78a394 SHA-1: 05ec8d9d67dd0c1385de345a1982183093bfaac1 SHA-256: 2201660bdabb1bc7ba01e91e7fdb330324672c00c2d83aaf3b615639ad0d70e7
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, a technique often used for SEO manipulation or to distribute malicious content. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=markov+chain+java'. The ML classifier also strongly indicated maliciousness. The document body is largely unreadable binary data, but the presence of the malicious URL and the link farm structure are strong indicators of a malicious intent, likely to lure 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/pify?keyword=markov+chain+java
    • http://files.masterclass-editing.com/uploads/1/3/2/7/132712225/bc37a8f5ad82cd9.pdf
    • http://files.linipik.net/uploads/1/3/1/1/131164310/nixofavipuwavo.pdf
    • http://files.southernillinoisbreastfeedingcoalition.com/uploads/1/3/1/6/131637136/8902361.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9592/files/badamoladonakudeluk.pdf
    • https://cdn.shopify.com/s/files/1/0437/4839/3112/files/salonokezopebaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/5350/6969/files/the_unit_theme_song.pdf
    • https://cdn.shopify.com/s/files/1/0429/6074/8695/files/wulifuvup.pdf
    • https://cdn.shopify.com/s/files/1/0434/6164/0358/files/satiludovegixipe.pdf
    • https://cdn.shopify.com/s/files/1/0437/5298/0641/files/77659660190.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1346/files/vekolovopozogolus.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/nevipetelebidefimod.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/54904393835.pdf
    • https://cdn.shopify.com/s/files/1/0433/8538/9206/files/28889911697.pdf
    • https://cdn.shopify.com/s/files/1/0435/4588/6884/files/53646351854.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_off0000a3d2.bin
9f705ef83a574ed8106987fe3b171e8ca1b7e23923b83c058d7e0372273450ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3D2 4880 bytes
font_01_sfnt_off0000b47f.bin
62b85d084aacfa697ac7ca0d48b879de8b5a96c18dc2c0b4909d1c690bddd146		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB47F 16096 bytes

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