Malicious PDF — malware analysis report

Static analysis result for SHA-256 f546dcf398da2a47…

MALICIOUS

PDF

32.6 KB Created: 2020-04-11 06:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0ae1b4ef00af23b97bcd80867f078ffc SHA-1: 3b8972ce2f2f4fd7ab776c1010552dab3948ecca SHA-256: f546dcf398da2a472ae41a48b5175e96145404ce99edb2c47231ad8897a3b4b4
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which are dynamically generated and point to SEO-optimized PDF files. The document body, though partially corrupted, indicates a lure related to 'Properties of triangles and quadrilaterals worksheet pdf'. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings confirm the presence of a link farm designed to redirect users. The primary intent appears to be directing users to potentially malicious content hosted on various domains.

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://74-123-73-16.mgwnet.com/uploads/1/3/1/6/131606453/131606453.html#properties+of+triangles+and+quadrilaterals+worksheet+pdf
    • http://tumwatercorporatepark.com/uploads/1/3/0/9/130969907/9516710.pdf
    • http://zaire4legacydebscholar.com/uploads/1/3/0/8/130874287/sodebolufazog_rozewufuz.pdf
    • http://mta-sts.stpaulslutheranchurchmapleridge.org/uploads/1/3/0/5/130540525/29f5498.pdf
    • http://galovilchescabrera.ca/uploads/1/3/1/4/131452803/6958683.pdf
    • http://neilestrick.com/uploads/1/3/0/7/130740117/zisololuw.pdf
    • http://meyanahotel.com/uploads/1/3/0/6/130640061/nazusegomatajege.pdf
    • http://thebelhamprimaryschool.org/uploads/1/3/1/4/131406527/7dd5babdf55d.pdf
    • http://sylviavanessaphotography.com/uploads/1/3/0/4/130483109/bugaruwexir.pdf
    • http://ssjohn832.com/uploads/1/3/0/9/130969599/2166478.pdf
    • http://sftutoring.org/uploads/1/3/1/6/131637503/kuxosonaba.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_off000058c7.bin
e9811826032e51a08e8ef0b73baf18da030d6993e861dae4da3aa888b31dcf48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58C7 7488 bytes

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