Malicious PDF — malware analysis report

Static analysis result for SHA-256 592680d3f3843ba8…

MALICIOUS

PDF

47.2 KB Created: 2020-08-15 07:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4dee6caeb5d4bad7adbb7f5ca8c5423 SHA-1: d87271ab4e915ee2cddf4a3365f54944a154b6bc SHA-256: 592680d3f3843ba856f18c2984ee6c924b093b92231a62270a660a8c607e64bd
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wb?keyword=cornerback%20drills%20pdf'. This indicates the document's primary purpose is to lure the user to this malicious URL. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=cornerback%20drills%20pdf
    • http://files.nhstudentwellness.org/uploads/1/3/0/7/130775970/notufeborurivun-kesekepasijesi-vepavi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1281/6026/files/simon_ielts_band_7.pdf
    • https://cdn.shopify.com/s/files/1/0432/5208/9000/files/guforidanifisi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7656/6684/files/php_generate_uuid.pdf
    • https://cdn.shopify.com/s/files/1/0431/5093/4173/files/psychology_books_in_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0435/2920/7957/files/byk_ceven_trke_okunulu_ve_aklamal.pdf
    • https://cdn.shopify.com/s/files/1/0438/9850/3336/files/36374657975.pdf
    • https://cdn.shopify.com/s/files/1/0431/4487/2085/files/angular_datepicker_directive.pdf
    • https://cdn.shopify.com/s/files/1/0430/7497/7945/files/accordi_canzoni_del_momento.pdf
    • https://cdn.shopify.com/s/files/1/0438/3227/9190/files/dalufozetelexafolira.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4031/files/pegojamu.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_off00007b17.bin
bca8f1c81aca04599b32c90c8c3e087a93f645009324d5cd4fd2a61754b332b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B17 5256 bytes
font_01_sfnt_off00008cfd.bin
9ebf32980e84a02cb0a14e1e204b6fb52a0eb3d8be4483035e46d254a9ccabd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFD 10704 bytes

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