Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77cf6d5966a55de…

MALICIOUS

PDF

36.1 KB Created: 2020-03-17 10:57:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 38a3c678e4a106bf37906b74e0e77858 SHA-1: b8337c9359c92ab4cf9fcba7833f73a47658aea6 SHA-256: b77cf6d5966a55dee79cfeccd229a85012607ec669d4d5a3c5aaf0b0b3021e20
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or to artificially inflate search engine rankings. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://lifteens.com/uploads/1/3/0/2/130274169/130274169.html#desenhos+para+imprimir+e+colorir+gratis+da+barbie
    • http://weirdtickets.com/uploads/1/3/0/8/130814342/4484522.pdf
    • http://www.margiemoos.com/uploads/1/3/0/4/130483354/pejen.pdf
    • http://knowvirtue.net/uploads/1/3/0/2/130291350/5067ce7209.pdf
    • http://almt.co.uk/uploads/1/3/0/7/130775780/58efd4039.pdf
    • http://djonesportfolio.com/uploads/1/3/0/8/130874564/3381474.pdf
    • http://ifeelinfinite.net/uploads/1/3/0/4/130488387/felumuwup.pdf
    • http://ruanntiller.com/uploads/1/3/0/2/130271045/1791114.pdf
    • http://www.sheimdal.com/uploads/1/3/0/4/130435834/1c2459.pdf
    • http://lilygreenstone.com/uploads/1/3/0/3/130312976/91627.pdf
    • http://binghaoy.com/uploads/1/3/0/7/130740461/5138098.pdf
    • http://walkrunleap.com/uploads/1/3/0/3/130324050/naboxibetazewa-lizazev.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_off0000638d.bin
1f3e0666d15a09d90ccded7763b632eb8d85e39361c5fc9d344942779684921a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638D 8872 bytes

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