Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8edadcca351628…

MALICIOUS

PDF

40.8 KB Created: 2020-08-22 06:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9c5dfa2d6c9440380a97c4f31a2499a SHA-1: d55bb0113dc39fbc23261ba8783f020697cd18c5 SHA-256: fd8edadcca3516288e80c248550f3be65b575f502d1bf6864c7ac2fae69acb20
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that leads to a link farm hosting numerous other PDFs. The document body, though heavily obfuscated, contains the target URL and keywords suggesting a lure for educational content. The ML classifier strongly indicates maliciousness, and the PDF-specific heuristics confirm the presence of malicious redirector and link farm behavior.

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.com/pify?keyword=elementary+statistics+questions+and+answers+pdf
    • http://files.natureexperiencetours.com/uploads/1/3/1/4/131406736/kusuzinivimemapa.pdf
    • http://files.thebowmanfund.org/uploads/1/3/1/4/131453919/gawin_gegun_lijaza.pdf
    • http://files.oursavinggrace.co.uk/uploads/1/3/1/8/131856498/8cadd82d2a0a5.pdf
    • http://files.davesartdimensions.com/uploads/1/3/1/6/131606348/vojetiborakupo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6115/files/54064582775.pdf
    • https://cdn.shopify.com/s/files/1/0440/7692/5078/files/20317001.pdf
    • https://cdn.shopify.com/s/files/1/0433/9712/0151/files/69067216627.pdf
    • https://cdn.shopify.com/s/files/1/0445/9154/6532/files/pififaparavigofok.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5510/files/pobifofebutofa.pdf
    • https://cdn.shopify.com/s/files/1/0438/8772/2648/files/54356119972.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/tutosajapavitos.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/how_to_get_mending_enchantment.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/budoribawamigosobadif.pdf
    • https://cdn.shopify.com/s/files/1/0437/7329/6789/files/ccna_full_form_in_medical.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_off000060e4.bin
f3f12fdb58719c036ed90c2b8bdccd6bc3cd79669b8ea7d2af9279133ef2e5d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60E4 5580 bytes
font_01_sfnt_off000073d7.bin
09330c54b9e11ec9878cd319cf6a36a8f3eacf093be92038aa2b1038e2032f99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D7 10100 bytes

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