Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d955021d725fde…

MALICIOUS

PDF

43.5 KB Created: 2020-08-10 04:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d520a56ab536b4d5b95df853973eac5 SHA-1: ddbfdf5bb56ceec6de6972095d074cf5ce07ab39 SHA-256: f5d955021d725fde5548c527524937a0e17a4cfe35a2cba1914515c50ebdf147
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a PDF link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector link. The ML classifier also flagged this PDF with high confidence. The primary attack pattern involves tricking users into clicking these links, which likely leads to a malicious site or further payload delivery.

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=engineering+applied+mathematics+2+pdf
    • http://files.diskyoto.com/uploads/1/3/1/3/131379219/tovotofunemor.pdf
    • http://files.caritas-academy.com/uploads/1/3/1/3/131380288/755478.pdf
    • http://diwulom.yourlocalelectricians.com/uploads/1/3/1/3/131398360/fowizepex-dobutojo-pojegubewep.pdf
    • http://files.churchgeneralcounsel.com/uploads/1/3/2/6/132696210/5829473.pdf
    • http://zibexu.bareprofessionalsugaring.com/uploads/1/3/0/7/130776394/gawunepewad.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/ripovevileb.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9736/files/swisher_ride_king.pdf
    • https://cdn.shopify.com/s/files/1/0430/6318/1473/files/12750986032.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/81301326048.pdf
    • https://cdn.shopify.com/s/files/1/0434/8516/7766/files/4866462175.pdf
    • https://cdn.shopify.com/s/files/1/0431/7885/2507/files/12558421325.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/jigiwum.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/kapekawefabilaweroxumaki.pdf
    • https://cdn.shopify.com/s/files/1/0431/1023/6321/files/povorapumukoxeti.pdf
    • https://cdn.shopify.com/s/files/1/0431/8861/7378/files/11378938623.pdf
    • https://cdn.shopify.com/s/files/1/0430/9418/0001/files/fefujuvenenepupozegatem.pdf
    • https://cdn.shopify.com/s/files/1/0438/2926/4546/files/how_to_cite_references_in_apa_format.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_off000068fb.bin
8624c720294aed3123e98191c446e94bc1ce2e69670db5b70360aee8e9eb296d
pdf-font-stream PDF embedded font (sfnt) at offset 0x68FB 5660 bytes
font_01_sfnt_off00007c1d.bin
0387cdbf165398840e9b84e9a4c7de7b11accfcd6b23abeab47fb7dda74f3102
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1D 10796 bytes