Malicious PDF — malware analysis report

Static analysis result for SHA-256 877b4ba868afe789…

MALICIOUS

PDF

34.9 KB Created: 2020-04-17 09:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 32375bbc719caf3a449ae8ad4045c577 SHA-1: 6b2102bfe4dd64ce22c7bb9e3e13ce2ecce92abd SHA-256: 877b4ba868afe78988ef3b0ce098208f0ed550a7fbaf790252cc9225f3c28679
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating a link farm or redirection scheme. The document body, though heavily obfuscated, contains a URL that matches one of the extracted links, suggesting an attempt to direct users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bitcointransactions.eu/uploads/1/3/0/4/130483253/130483253.html#blue+bell+publication+answer+key
    • http://mathgeektutoring.com/uploads/1/3/1/4/131407892/9691729.pdf
    • http://aylestoneallotments.org/uploads/1/3/0/7/130775510/0d5a76.pdf
    • http://deercreekarchery.com/uploads/1/3/0/5/130544352/kejosupibe_sanejomufevo_lujaruses_tipoba.pdf
    • http://mytrainerbrandon.com/uploads/1/3/0/5/130538945/safitaxusek_zozemidujiwiz_dexiziku_waxomat.pdf
    • http://miguelfreireradio.com/uploads/1/3/0/7/130738884/9bf2f746eaa.pdf
    • http://paradisegardensofbr.com/uploads/1/3/0/2/130288426/8883741.pdf
    • http://nicoleteague.com/uploads/1/3/0/7/130739927/3d416cd3dfb.pdf
    • http://getfitinsantafe.com/uploads/1/3/0/5/130588568/mizunetekenimifu.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_off00005fac.bin
f5ed3233b53a9df27bef52d492184996864f26ed424bc6923aa697372605cb5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAC 7928 bytes

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