Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13ea6f0d49ac520…

MALICIOUS

PDF

29.7 KB Created: 2020-06-08 00:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5fd99e972a09b75861a141a91b26711 SHA-1: 304f3db607954204137d8096034b868735d32335 SHA-256: b13ea6f0d49ac52058e5fe21db4790ae1bfd422933fecd6ab7dc445979fdc439
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, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to a 'bus game' and the authoring application 'wkhtmltopdf', suggesting a lure. The primary intent appears to be directing users to a vast network of linked PDF files hosted on various domains, likely for SEO spam or to distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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://aia-eugene-pcavote2019.com/uploads/1/3/0/6/130604681/130604681.html#kamil+ko%25C3%25A7+otob%25C3%25BCs+oyunu
    • http://wellnessbakes.com/uploads/1/3/1/4/131437198/zikofedaduni.pdf
    • http://74-123-73-37.mgwnet.com/uploads/1/3/0/4/130435622/4681738.pdf
    • http://institugolf.com/uploads/1/3/0/6/130605412/102035.pdf
    • http://2qc.undesirable.us/uploads/1/3/0/8/130874524/rilojajotelaze_jonelubizak_sepiwegumose.pdf
    • http://whitneyelliott.com/uploads/1/3/1/3/131378774/eb1198d33182.pdf
    • http://trajectory.biz/uploads/1/3/0/3/130323554/vawisunawixafuv-kotisizemesi-xatiketanim.pdf
    • http://pinkpastries.net/uploads/1/3/1/3/131384735/5be571f.pdf
    • http://andrewconstantineart.com/uploads/1/3/1/0/131070381/poviwikidas_mijiliki_sudok_buwugukuwa.pdf
    • http://ronswalktalks.com/uploads/1/3/0/7/130776089/zakumusexomisu_mazewarolusepo_xexelisidifu_bujigezefakapus.pdf
    • http://service-share.org/uploads/1/3/0/6/130639442/7f5461cec1b154.pdf
    • https://letajesuki.files.wordpress.com/2020/06/xoredusu.pdf
    • https://nuwasiv.files.wordpress.com/2020/06/39069558800.pdf
    • https://zolukid.files.wordpress.com/2020/06/dapelivisajog.pdf
    • https://konuvemove.files.wordpress.com/2020/06/36864218662.pdf
    • https://pofuwake.files.wordpress.com/2020/06/tilubag.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_off00004a18.bin
d10a9c9c5b877c3140fd09d09e2ce12e1cfa9cfcd6d849db93854e14e5395169		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A18 9884 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.