Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c4f2b2cd865786…

MALICIOUS

PDF

59.0 KB Created: 2020-08-12 01:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55507e2527e7047617c6b4b25a74b03d SHA-1: 79742a34041c9581ae13d4228d4f31772418be9f SHA-256: b4c4f2b2cd8657864d43d9a6ad8762dd3f0453a3ab37ce69613711d9facaff16
120 Risk Score

Malware Insights

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

The PDF contains numerous links, identified as a link farm, with one critical heuristic firing indicating a redirect to known malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'Canula nasal de alto flujo pediatria pdf' and the authoring application 'wkhtmltopdf', suggesting a lure. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing or scam site.

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=canula+nasal+de+alto+flujo+pediatria+pdf
    • http://files.metaphysicshouse.com/uploads/1/3/1/6/131606968/noxopajuwe.pdf
    • http://files.jessicasomerville.com/uploads/1/3/1/4/131437680/9009647.pdf
    • http://files.elasad.com/uploads/1/3/0/9/130969470/kuwed_niwub_koselotel_kufemevuneziso.pdf
    • http://files.vietnamcafesandwich.com/uploads/1/3/0/7/130775563/adcb77c45c.pdf
    • http://tobenufe.floorexpertslimited.co.uk/uploads/1/3/1/8/131856271/zimodagixisi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5904/3749/files/xutebemanowawilob.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/rivubebabes.pdf
    • https://cdn.shopify.com/s/files/1/0446/5616/5027/files/building_construction_mckay_volume_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/4670/7104/files/semikolabogowuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/1300/3674/files/92619348447.pdf
    • https://cdn.shopify.com/s/files/1/0433/5193/3078/files/18497973437.pdf
    • https://cdn.shopify.com/s/files/1/0434/7507/5225/files/secondary_hypertension.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/nawijesimiweju.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/fimadawafatikofadusuwepi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4687/1974/files/sokusivax.pdf
    • https://cdn.shopify.com/s/files/1/0434/2035/2677/files/entire_contract_provision.pdf
    • https://cdn.shopify.com/s/files/1/0452/2590/2240/files/housing_society_bye_laws_karnataka.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5798/files/kikebexuvasilejejawuzere.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009157.bin
a4c36e1788142e1f759ab611c214acb671bc44bec8f79517e62e8a7899bcc25b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9157 5016 bytes
font_01_sfnt_off0000a275.bin
217a46771f84a73d8c1863bdafc6b5163d21a800c0490ec80170d47921e83f9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA275 14620 bytes
font_02_sfnt_off0000d00e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xD00E 4324 bytes