Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb61cd0e54a2e1f…

MALICIOUS

PDF

52.9 KB Created: 2020-04-22 00:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0c570c4f4ed60889b59f85715af9e558 SHA-1: 175a9d02da74f84c4a78741d94086e53c1f5adc6 SHA-256: dfb61cd0e54a2e1f3f405115dec57e60b51031c374dd4a6573105c24de8f432c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The document body is heavily obfuscated and appears to contain junk data, but the presence of numerous external links is the primary indicator of malicious intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://always-forever-sunshine.com/uploads/1/3/0/4/130483478/130483478.html#manualidades+faciles+para+ni%C3%B1os+4+a%C3%B1os
    • http://mort-irina.com/uploads/1/3/0/7/130739533/03381a0c944f09.pdf
    • http://nestingnet.com/uploads/1/3/0/4/130488530/d7b87331e03.pdf
    • http://newspin.net/uploads/1/3/0/3/130379675/wosupixises.pdf
    • http://beachesdbt.com/uploads/1/3/1/3/131379375/madowu.pdf
    • http://lhugginslawllc.com/uploads/1/3/0/6/130620395/kiwumadivexabof.pdf
    • http://seacoastbikes.com/uploads/1/3/1/3/131398154/1486497.pdf
    • http://thetradersgroup.org/uploads/1/3/1/4/131413678/1335932.pdf
    • http://dlhp-solutions.com/uploads/1/3/0/4/130476086/3165229.pdf
    • http://newspin.net/uploads/1/3/0/3/13037967
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085bb.bin
1c89f5ef5498951db97821876fccc0ab919b121f677aa0cfc6334237c2119bf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85BB 9240 bytes
font_01_sfnt_off0000a718.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA718 1708 bytes
font_02_sfnt_off0000af7e.bin
bb7f3a77f7833b39fe6b0cf08265a5ad0460cb4bda91382e6c877c0db3ce514d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7E 16164 bytes

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