Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb3dd56b19aa136…

MALICIOUS

PDF

39.1 KB Created: 2020-08-19 09:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3c4b535afb4c6ad62e11170cceb2b50 SHA-1: fe577e18ae7d737337c2f0ba2f4fa96926060f2f SHA-256: fdb3dd56b19aa136e124809a7ab066e40fc3cb5224df688b788decb19be03c18
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector at 'https://ttraff.cc/pify?keyword=cooling+curve+questions+answers'. The document body, though heavily obfuscated, contains this URL, suggesting the primary intent is to redirect the user to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=cooling+curve+questions+answers
    • http://files.mountainmovingjourney.com/uploads/1/3/2/6/132682561/621c7139572930.pdf
    • http://files.thesconnection.com/uploads/1/3/2/8/132814900/tejedosesew-nibijolol.pdf
    • http://files.colorblast5k.org/uploads/1/3/1/4/131412235/luloxefotevijunoz.pdf
    • http://files.actioncomputerservice.com/uploads/1/3/1/3/131378990/xukizo_mivonip_sedana.pdf
    • http://tidijaf.larienca.net/uploads/1/3/1/4/131453536/2dc13cd5358c58.pdf
    • https://cdn.shopify.com/s/files/1/0437/4652/5338/files/marekita.pdf
    • https://cdn.shopify.com/s/files/1/0435/3851/4071/files/quiste_de_segundo_arco_branquial.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/31106280728.pdf
    • https://cdn.shopify.com/s/files/1/0434/3303/3877/files/15963966321.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4780083199.pdf
    • https://cdn.shopify.com/s/files/1/0431/0584/5397/files/genemopoxevogikuxufutofos.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/basanokajamaponilatugoga.pdf
    • https://cdn.shopify.com/s/files/1/0440/8908/2006/files/rubodunewuxet.pdf
    • https://cdn.shopify.com/s/files/1/0430/5502/2234/files/guvowoxuwomafazuloki.pdf
    • https://cdn.shopify.com/s/files/1/0430/2195/9325/files/menubiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/babylonian_civilization_inventions.pdf
    • https://cdn.shopify.com/s/files/1/0437/5799/4138/files/71942145571.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_off00005b3a.bin
3ca94bed793620676b21cdded8923947614eb2a350bd07f88c0620cc50383d8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B3A 5152 bytes
font_01_sfnt_off00006ce4.bin
37f4a732f9671171e1df7ad9a6f9ed2e3b6e6f0cc2c37aff051265d9c98602e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE4 10088 bytes