Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a170966d3e50cf…

MALICIOUS

PDF

55.6 KB Created: 2020-04-30 00:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9e8534a1c8bb97563192ef3f280ec686 SHA-1: c466e2b2e7a5fe8bec16fa9a88ae91bf6e01e2db SHA-256: 03a170966d3e50cf0166d2b0955df70358f44dddbd8bb37803e4643380d20433
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many with numeric slugs, suggesting a link farm designed to redirect users to malicious websites. One such URL, http://olabilrace.club/uploads/1/3/0/9/130969216/130969216.html#adblock+plus+mozilla+firefox+free, is presented with a lure of 'Adblock plus mozilla firefox free'. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. No scripts were extracted, but the extensive link farm points towards a phishing or redirection scheme.

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://olabilrace.club/uploads/1/3/0/9/130969216/130969216.html#adblock+plus+mozilla+firefox+free
    • http://cpcadventurersclub.com/uploads/1/3/0/3/130313088/gurivezutifo_bonebafim_govekamumem_mewat.pdf
    • http://onegreatdream.com/uploads/1/3/0/6/130604196/zopasirimoxamenor.pdf
    • http://clubheros.org/uploads/1/3/0/5/130551066/voxod.pdf
    • http://elevatedadulting.com/uploads/1/3/1/4/131453028/waxonomuxoja.pdf
    • http://lashawnphoto.com/uploads/1/3/0/7/130776629/ruziguxajax.pdf
    • http://tamtiques.com/uploads/1/3/1/4/131408117/robinafidudumad_jexovewaj.pdf
    • http://hecallsmecharlie.com/uploads/1/3/1/4/131406970/1740686.pdf
    • http://flagstaffsings.com/uploads/1/3/0/3/130379126/3839838.pdf
    • http://rightbrainuni.com/uploads/1/3/0/3/130313755/ludejas_zejasaxororir_telawewava.pdf
    • http://thecommunityengineer.com/uploads/1/3/0/4/130475965/eb4b23ab8b.pdf
    • http://mavemontajes.com/uploads/1/3/0/5/130544070/9bb678f83c8fa.pdf
    • http://rossloto.site/uploads/1/3/0/5/130552084/miloduzenajotix.pdf
    • http://salonexige.com/uploads/1/3/0/2/130271108/8e8f2ccb781af.pdf
    • http://homepoetsi.org/uploads/1/3/0/9/130969506/wupogogudod.pdf
    • http://virtuallynotarized.com/uploads/1/3/1/4/131438071/5750770.pdf
    • https://help.com
    • 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_off0000b17b.bin
94d569354409b6162ced7bcd8dca5c5d862fb414e3ec4dd6a2b0aca43d0dc15b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB17B 8020 bytes

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