Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa25c706f34b227a…

MALICIOUS

PDF

35.1 KB Created: 2020-08-11 19:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65e1177e99d81088a44b23815f212c55 SHA-1: 14f14c1c3c509536517ad52d5cc1eebe9d595c99 SHA-256: aa25c706f34b227a42465f42e61f03964560dfffa88fb14b942bb244b7dc59e3
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/wb?keyword=carroll%20diagram%20worksheet%20ks1'. This suggests a phishing or social engineering attack aiming to redirect the user to malicious infrastructure. The document body, though heavily obfuscated, contains the same URL, reinforcing its role as a lure. The presence of many links to Shopify domains, while some are benign, indicates a link farm strategy to obscure the malicious destination.

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=carroll%20diagram%20worksheet%20ks1
    • http://dusiba.pastpatriot.com/uploads/1/3/1/6/131606490/7863677.pdf
    • http://files.mscarreyslearninggateway.com/uploads/1/3/0/8/130815009/4329f41.pdf
    • http://files.otakipotteryclub.org/uploads/1/3/0/8/130813357/1665960.pdf
    • http://moside.massageandfacialorganics.com/uploads/1/3/2/6/132695535/30c1c3bb.pdf
    • https://cdn.shopify.com/s/files/1/0432/1263/6322/files/4404037539.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/dumatidusuwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/sosogufafelamawo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7341/4055/files/96160199387.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21659337375.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2622/files/ffxiv_dark_knight_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9590/0828/files/degekepotoruvibo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/bioassay_of_acth.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1068/files/affordable_housing_scheme.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5229/files/ripid.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/59838287994.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9644/files/printable_blank_monthly_calendar.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_off00004c79.bin
d84e5257c1227921ae0c26e86d15302d8f2f0294c82815e9f9e28d5fe3e44521		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C79 5352 bytes
font_01_sfnt_off00005ea2.bin
39ce3bb44209b9baa4420860be16adc3fa9d644f0eeeb322d885f5dfd02edc5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA2 9660 bytes

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