Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8b73451400ac31…

MALICIOUS

PDF

27.0 KB Created: 2020-04-15 21:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eeacc3f7caab596cd70f638a0de6a7fe SHA-1: 88f62758de690b7a3246fe8bebfe5e46ec0ba514 SHA-256: 9c8b73451400ac3111bec43a0c9054a94deec36d01b5eda262f78b6029f146fb
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, embedding numerous URLs that point to external PDF documents. The document body suggests a lure related to "multiple photo blender apk", aiming to entice users to click on the embedded links. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links, likely intended to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://grocyber.net/uploads/1/3/0/5/130588773/130588773.html#multiple+photo+blender+apk
    • http://dominatrixindenver.com/uploads/1/3/0/6/130604427/53366c3b.pdf
    • http://happydaysofbrit.com/uploads/1/3/1/0/131071209/9047139.pdf
    • http://askmarct.com/uploads/1/3/0/6/130620290/f786bb823c.pdf
    • http://lightisadrug.com/uploads/1/3/0/7/130740231/lologegaki-sifapoxi.pdf
    • http://meisterreinigung.org/uploads/1/3/1/4/131406985/839a03b4074fa.pdf
    • http://cld.nu/uploads/1/3/0/3/130323523/65d936f4.pdf
    • http://iamthemuseum.com/uploads/1/3/0/6/130604091/fabolopiganotijuf.pdf
    • http://amadispanaderia.com/uploads/1/3/0/6/130604862/vizebopinibelebagad.pdf
    • http://simtravel.org/uploads/1/3/1/6/131606367/acce105e730.pdf
    • http://streamsideministry.net/uploads/1/3/0/8/130815080/045126abc6.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047c1.bin
3114ea839853c8de98120d9a28ed3092b4b4b8b5b0bf279accd5669782856c5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47C1 5944 bytes

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