Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac7684c70f38125…

MALICIOUS

PDF

37.8 KB Created: 2020-04-27 03:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e2e6af5043c4c424ae39e5ee08e95313 SHA-1: 266037f287e906f94bac11619f73b523d92bed33 SHA-256: 3ac7684c70f3812569d17db66b5191c9be4c000b5d36e73e8914032e4d7c1c24
96 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous external URLs pointing to other PDF files. The document body text, though partially corrupted, suggests a lure related to a meditation book, likely to attract unsuspecting users. The presence of a PDF_SEO_LINK_FARM heuristic firing strongly indicates a malicious intent to manipulate search engine results or distribute further malicious content through these links. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://hmfirewood.com/uploads/1/3/1/8/131856173/131856173.html#beginners+guide+to+meditation+book
    • http://hoptubs.com/uploads/1/3/1/3/131381787/ditefovifosat.pdf
    • http://55688carce.com/uploads/1/3/0/7/130775336/479956bf.pdf
    • http://southfloridafarmers.com/uploads/1/3/0/7/130776385/pagulibewe-pofubudesi-xorajolasijez-zuzotut.pdf
    • http://skyfootgoddess.com/uploads/1/3/1/0/131070847/sufalo_jedax.pdf
    • http://ambermargeticphotography.com/uploads/1/3/0/6/130604465/ridex.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_off00006cfb.bin
735672089dffa58017f243d55fb85ca3dff9ad37965e26ea775ab6dea1f27bf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFB 7916 bytes

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