Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a9cddf5cb99752…

MALICIOUS

PDF

38.0 KB Created: 2020-04-12 13:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 86d096e209ead609640317c0da28b2bd SHA-1: 2411dc173cca9f80c488f045985dbf5d963d322b SHA-256: b4a9cddf5cb99752249370d37375a72c44fb23ff765f4bdbc7b0b96b570ca595
62 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files with numeric slugs, indicative of a link farm or SEO abuse. One of the embedded URIs, http://deceptivelysimple.com/uploads/1/3/1/3/131379824/131379824.html#optiplex+xe2+spec+sheet, is presented as a specification sheet, likely a lure to trick users into clicking. No scripts were extracted, but the extensive link farm suggests a campaign focused on driving traffic to potentially malicious sites.

Heuristics 3

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://deceptivelysimple.com/uploads/1/3/1/3/131379824/131379824.html#optiplex+xe2+spec+sheet
    • http://thecraftjunkies.com/uploads/1/3/0/5/130588299/4936474.pdf
    • http://mesfsl.com/uploads/1/3/0/6/130620475/edc51bb6aaaed.pdf
    • http://charlesriverpsychotherapy.com/uploads/1/3/0/8/130874645/1612158.pdf
    • http://airforcemama.com/uploads/1/3/1/4/131438228/4455235.pdf
    • http://jpmcbride.com/uploads/1/3/1/0/131071308/bilulewisawexi.pdf
    • http://iconmx.com/uploads/1/3/0/5/130543006/9047073.pdf
    • http://girlmeetsmouse.com/uploads/1/3/0/5/130551836/b92e271.pdf
    • http://avakir.xyz/uploads/1/3/0/5/130550980/25228170505.pdf
    • http://charlesriverpsychotherapy.com/uploads/1/3/0/8/130874
    • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b58.bin
a990c5232a94b1c8d0bbe05a8522795c679369f2b5961a8f462d3dc71e22d4c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B58 8688 bytes

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