Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb34af35de26e41…

MALICIOUS

PDF

125.3 KB Created: 2020-08-12 07:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8df0860a5d83f2f4bc47a10f6a838b77 SHA-1: 41390573a3e3823c02424ba7dd09e52328d399e2 SHA-256: bbb34af35de26e4166c43dffa69dc900059b2a259b99b77c372936ac1e2a3580
120 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is a 'biology text book pdf', which is likely a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, further supporting the malicious intent of directing users to external, potentially harmful, sites.

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=10+class+biology+text+book+pdf
    • http://files.hersacredsanctuary.net/uploads/1/3/0/7/130775368/vibawotalazuki.pdf
    • http://vepaxawap.wolfcreekinternational.ca/uploads/1/3/1/4/131406668/lomadiwoxod_sokub_denogugowobuxu_tirozosupaxovis.pdf
    • http://gakamu.casa-office.co.uk/uploads/1/3/1/3/131383790/semajipoz_lazifuxuja_dutidezebetugeb.pdf
    • http://files.australasianeducare.com/uploads/1/3/0/8/130814129/3f0899b78.pdf
    • http://pukugusad.jacquelineorr.com/uploads/1/3/0/7/130775934/5240926.pdf
    • https://cdn.shopify.com/s/files/1/0429/2745/6419/files/lay_linear_algebra.pdf
    • https://cdn.shopify.com/s/files/1/0432/9052/5849/files/xebimaseko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dazexirorojukulovamedifuv.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/9016623349.pdf
    • https://cdn.shopify.com/s/files/1/0446/6507/7913/files/56419571082.pdf
    • https://cdn.shopify.com/s/files/1/0431/8006/4936/files/13425140910.pdf
    • https://cdn.shopify.com/s/files/1/0439/6823/3630/files/41129371304.pdf
    • https://cdn.shopify.com/s/files/1/0429/2050/9596/files/clicker_heroes_mobile_save_file.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/nojedekota.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/kesetaputenatuxuxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/buxidumex.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_off0001aeb4.bin
dc0922c65f6aefccb6fd553d0386abfa5383d0ccf68ca206301a4c50f8fa5fa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEB4 5700 bytes
font_01_sfnt_off0001c234.bin
684205a0c4348fadb5211cd45afa98070c9a8c792739efaeab6f07b4356719cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C234 11348 bytes

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