Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb4ba201bc48285…

MALICIOUS

PDF

44.6 KB Created: 2020-08-07 21:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acb8f4cff81c8baaf25ff993f998c37f SHA-1: bcfdfa32616f40e3a0a16ca50a7e9bbac8b64b63 SHA-256: ceb4ba201bc48285c17a11903aa20316dac4660049788b7623a47bd3d94db0e3
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains. One of these links, 'https://ttraff.ru/pify?keyword=abc+anglais+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO poisoning campaign designed to redirect users to malicious sites.

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.ru/pify?keyword=abc+anglais+pdf
    • http://files.citizensforenvironmentalstewardship.org/uploads/1/3/0/7/130739415/dedunigoxajim.pdf
    • http://files.mccoyandmcnaughtonholdings.com/uploads/1/3/1/6/131636725/4cb72db.pdf
    • http://mugogoj.innovationtoursgreece.com/uploads/1/3/1/4/131453194/ddde66880f.pdf
    • http://files.3dbikefit.com/uploads/1/3/0/7/130775174/rowez_sosidisosor_vawegipoguvifor_ludazekeforosiw.pdf
    • http://doketi.andcreation.ch/uploads/1/3/1/4/131407995/nipiletaze-kojitu-fafitalavijuw-gigojazet.pdf
    • https://cdn.shopify.com/s/files/1/0452/9078/2881/files/diccionario_biblico_ilustrado_holman.pdf
    • https://cdn.shopify.com/s/files/1/0434/3765/4178/files/nujijevaporodav.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/35941514430.pdf
    • https://cdn.shopify.com/s/files/1/0430/7684/5728/files/ultrasound_diathermy.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/le_bilinguisme_au_cameroun.pdf
    • https://cdn.shopify.com/s/files/1/0437/2565/2117/files/word_smart_2.pdf
    • https://cdn.shopify.com/s/files/1/0438/3332/7776/files/zonerotifujazupomerokeben.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/danavuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/4122/5880/files/pagokubefuvu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3059/4204/files/kofukefo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0489/5143/files/64744072695.pdf
    • https://cdn.shopify.com/s/files/1/0436/5356/2526/files/nesetexexapilejoxenifu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9112/2584/files/bivufunizekamopalak.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_off000063c7.bin
fb47f5abdd35d0d8d5ca47fd8a2ea9ce28166a92b364ef2bce9563459d1cb01b
pdf-font-stream PDF embedded font (sfnt) at offset 0x63C7 5356 bytes
font_01_sfnt_off00007613.bin
d916251fe9068e28bc7b58c8c5531809e990a012922fa1a659cebffe200b6251
pdf-font-stream PDF embedded font (sfnt) at offset 0x7613 15044 bytes