Malicious PDF — malware analysis report

Static analysis result for SHA-256 df722fc103787770…

MALICIOUS

PDF

40.3 KB Created: 2020-04-18 20:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d3798b0e18f3eeebaf7b1b5f6f3e4e17 SHA-1: 4b2668200a42cad5fcbea9d884353af1493fe8be SHA-256: df722fc1037877707df55dc31375387d4f1cb1b99fb6699f8fc90cf27595d02d
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm or SEO abuse for malicious distribution. The document body text, though partially corrupted, contains a reference to 'logo quiz answers level 3 android' and a URL that matches this theme, indicating a lure to a potentially malicious website. The ML classifier strongly flagged this PDF as malicious.

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://5pointauto.com/uploads/1/3/0/2/130272452/130272452.html#logo+quiz+answers+level+3+android
    • http://wickedladiesbeeco.com/uploads/1/3/0/3/130313398/wenemepuduledoxupi.pdf
    • http://worldwidetradecorporation.com/uploads/1/3/0/7/130738614/sozenize.pdf
    • http://sdavidsproductions.com/uploads/1/3/0/6/130604807/bijezazinixuzek-vuluzi-sikibamo-bidir.pdf
    • http://terrisuniquecollections.com/uploads/1/3/0/5/130551427/9032623.pdf
    • http://smiling-frog-hoppers.com/uploads/1/3/0/6/130639787/311c0d0.pdf
    • http://dianaarrr.com/uploads/1/3/1/4/131406950/domevumu-xipula.pdf
    • http://simmon.ca/uploads/1/3/0/2/130288630/folomebunenanez.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_off000072e7.bin
e8b729997469e57232a3fec65aa580a0e5a4c4953b0ffe9a3d1d6ae0f58e2869		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E7 8684 bytes

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