Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67aca9ca0634264…

MALICIOUS

PDF

40.8 KB Created: 2020-08-12 06:39:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 070082ecccb1409960218e7a928d8bd3 SHA-1: 6b7d932862aadbe9f9ea4d9e53893f8aa6cfa94a SHA-256: a67aca9ca06342649978c3c80de9b7623a8096d072f4d51535b7d19fe15386d7
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. The primary malicious URL is https://ttraff.ru/wb?keyword=food%20web%20worksheet%20activity, which is likely used to redirect the user to further malicious content. The document body, though heavily obfuscated, contains this URL and appears to be a lure for a 'food web worksheet activity'.

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=food%20web%20worksheet%20activity
    • http://vafok.astronumerologywisdom.com/uploads/1/3/2/6/132695569/wikemejal.pdf
    • http://wonesefi.faysoriginals.net/uploads/1/3/1/3/131380600/1cb9d2cab.pdf
    • http://files.foodstartuphelp.com/uploads/1/3/0/8/130874110/1367219.pdf
    • http://files.shannonmacfarlanephotography.com/uploads/1/3/1/4/131437037/metinilatov.pdf
    • http://files.judithannabramsproductions.com/uploads/1/3/0/8/130814205/rigoweritepolobofotu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4746/0768/files/retonelewujajojukisemades.pdf
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/95094296235.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/betojebomuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5549/6866/files/85169636646.pdf
    • https://cdn.shopify.com/s/files/1/0428/5110/6972/files/fisesi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6640/9639/files/70368815595.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7717/files/pivivexegalefo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1502/0448/files/possessivpronomen_bungen_a1.pdf
    • https://cdn.shopify.com/s/files/1/0434/4312/6438/files/anterior_cruciate_ligament_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0434/6806/2872/files/zizuxidezaredomazutoxan.pdf
    • https://cdn.shopify.com/s/files/1/0439/3140/2395/files/benihana_happy_hour_menu.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_off00006299.bin
8f2e69d8191247eb498c978654116dceb5e1b0160c6c84e6ca2cc3b2f892ab78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6299 5408 bytes
font_01_sfnt_off00007514.bin
9ea22428275d0d0a34b23939c8bc3c74f198ab4293c69c71839bfa4cc67c3af9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7514 9876 bytes

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