Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5631f0621491bc7…

MALICIOUS

PDF

40.2 KB Created: 2020-09-01 04:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6d66ce6e5c00cd6025222a82f5f3313 SHA-1: b1afc02a6efbe24b668c6fef1708fd19189b7cc7 SHA-256: f5631f0621491bc76c03c3f599253daf30e1444e060ef51705661e296e8b4354
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as educational content, with a primary malicious redirector URL. The ML classifier strongly indicates malicious intent. The document body, though partially corrupted, contains the keyword 'biology notes for class 11 pdf' and the malicious URL, reinforcing the lure. The primary malicious IOC is the redirector URL, which likely leads to further stages of infection.

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.cc/wix?keyword=biology+notes+for+class+11+pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0036/files/97118346854.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/52848233936.pdf
    • https://cdn.shopify.com/s/files/1/0430/3280/5527/files/cambio_climatico_que_es.pdf
    • https://cdn.shopify.com/s/files/1/0434/0046/2503/files/math_worksheets_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1208/files/canon_rebel_cannot_format_card.pdf
    • https://cdn.shopify.com/s/files/1/0431/0161/8327/files/zapuzopewon.pdf
    • https://static.usrfiles.com/ugd/1b8612_418dbf592036486e80f174bc1ddc07de.pdf
    • https://static.usrfiles.com/ugd/d775a9_40bbc8b385a4479b9c24f0f3b495ed8f.pdf
    • https://static.usrfiles.com/ugd/8cbfce_79d6781a9ccc41da8a2df683c728c78c.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3152232763.pdf
    • https://cdn.shopify.com/s/files/1/0432/3645/8654/files/calabozos_y_dragones_juego_de_mesa.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_off00005ece.bin
ed160a7d392ea13145c71580bd4e24177f886d29a06929739a7426d9b2fd4499		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECE 5524 bytes
font_01_sfnt_off000071c0.bin
c8256b2b1ff13fb7597a6a7be6b929554eb47f9b50a08d51bdeb5361df7c5b56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C0 10200 bytes

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