Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b53cf7c9c10bde…

MALICIOUS

PDF

45.6 KB Created: 2020-04-27 19:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3641becabb8bf2611edd77d57afa8383 SHA-1: 8a680745572386e55434949a4af60a598be40a52 SHA-256: 88b53cf7c9c10bde9ed12f4d4226a0bf48aee8dcb38e07cb0310241945f5cc68
94 Risk Score

Malware Insights

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

The PDF document contains a lure for a "free vpn for laptop" and embeds a large number of external links, characteristic of a link farm or SEO spam campaign. The primary URL leads to a page that itself hosts numerous PDF files, suggesting a multi-stage redirection or content hosting mechanism. The ML classifier strongly flagged this PDF as malicious, supporting the observed link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://theslaterhousepdx.com/uploads/1/3/1/8/131871658/131871658.html#free++vpn+for+laptop
    • http://callgirlklcc.com/uploads/1/3/1/0/131070874/savunus.pdf
    • http://mcquaidwoodworking.com/uploads/1/3/0/7/130738623/1587665.pdf
    • http://hmannesfaserninc.com/uploads/1/3/0/7/130738566/3b9ef903eee776.pdf
    • http://morganascloset.com/uploads/1/3/1/3/131378796/xeforupi.pdf
    • http://dreambookpublishing.com/uploads/1/3/1/4/131454237/485331998bb6.pdf
    • http://insimonwetrust.com/uploads/1/3/1/4/131452840/pobeguvat.pdf
    • http://peterdom.org/uploads/1/3/1/6/131606402/527de12923b3.pdf
    • http://www.yestresspassing.com/uploads/1/3/0/5/130544001/rikesunodejebuj_winamokivid_tabuxasomu.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_off000089da.bin
cc80e45e056d884faf1136cfc91c46470c1eba91c632f9326826312df2978e79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89DA 8596 bytes

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