Malicious PDF — malware analysis report

Static analysis result for SHA-256 9937e8217d8b8d2c…

MALICIOUS

PDF

33.4 KB Created: 2020-08-19 16:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0ba735e0d9e487311eb0c2939250518 SHA-1: deeab84faf7270b907d2840f44730945581795b4 SHA-256: 9937e8217d8b8d2c9d285a0ed0d608d8fea015748d634a6b802e77ef955bdc72
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.ru', which is also present in the document body. Additionally, it exhibits a PDF link farm pattern with numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be a social engineering lure disguised as a financial report to trick users into clicking the malicious link.

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=quickbooks+report+uncleared+cheques
    • http://faleg.maysplumbingworks.com/uploads/1/3/0/8/130814729/rujixapixorarunu.pdf
    • http://files.swisskissgreaterswiss.com/uploads/1/3/0/8/130814343/zozabugopojix_punoje_dotaxum_rudesilebug.pdf
    • http://tarop.philscrap.com/uploads/1/3/1/6/131606289/dabovunedodid.pdf
    • http://files.gangneungtours.com/uploads/1/3/1/4/131453143/pazivisakeze-rixoforaverif-zufuzopoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1943/files/ligoton.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/pesetimokomidik.pdf
    • https://cdn.shopify.com/s/files/1/0439/8107/8686/files/keduraruxadutimujatise.pdf
    • https://cdn.shopify.com/s/files/1/0430/9178/7937/files/swing_trading_books.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/ropatifusajakorekulu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0653/3525/files/retefakaxedanogifitujog.pdf
    • https://cdn.shopify.com/s/files/1/0433/8237/4561/files/afunika_piki_piki_skirt_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/axonotmesis_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0437/5091/6247/files/asphalt_8_apk_free_highly_compressed.pdf
    • https://cdn.shopify.com/s/files/1/0437/3318/8762/files/jotalerexe.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_off000048b3.bin
00f41aa49f27319eed155f17962ac5de01211fc472fb1dc177f607eaf84ee7ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48B3 5552 bytes
font_01_sfnt_off00005b74.bin
f8d62b7d3cca450dcc23404d6ffadb92a7a0122aabf1151b2d148e3e5d7c7813		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B74 8696 bytes

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