Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a073ac2dea8bf7…

MALICIOUS

PDF

39.1 KB Created: 2020-03-24 22:00:43 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c4d5a1d078620a7891d54b73d9b2d6fc SHA-1: 5317612a03483717224a9ae4145d10b532b8bd30 SHA-256: 74a073ac2dea8bf7191ec534f46efabc5029e443e0997840a1d161defad3486f
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links to external PDF files, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links points towards a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the sheer volume of external links is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://boysandgirlsdl.org/uploads/1/3/0/2/130289503/130289503.html#harry+potter+and+the+cursed+child+theatre+tickets+price
    • http://hostmaster.eaglebrooks.com/uploads/1/3/0/9/130969588/7494269.pdf
    • http://mta103.qualitynow.net/uploads/1/3/0/5/130550882/3de6212b9c27.pdf
    • http://meohealthcare.com/uploads/1/3/0/6/130605426/c8e5037.pdf
    • http://fuckingprogress.com/uploads/1/3/0/5/130543158/lagiruzejedediv.pdf
    • http://thehippygreen.co.uk/uploads/1/3/0/9/130969511/dd5bda6992.pdf
    • http://demureduchessfilms.com/uploads/1/3/0/2/130272631/nisesiban-lesefowukewadov-wiwatiwanelovov.pdf
    • http://www.bluekavir.co.nz/uploads/1/3/0/8/130873782/48669c34a61e8.pdf
    • http://rejuvenatemedical.co.uk/uploads/1/3/0/6/130620719/1466839.pdf
    • http://encyclobeerdia.com/uploads/1/3/0/8/130815582/fuletuludopokug.pdf
    • http://mytravel.guide/uploads/1/3/0/3/130379561/vidokunib.pdf
    • http://cfdmcentralcalifornia.org/uploads/1/3/0/6/130604502/nilemuroduki_wiwepaji.pdf
    • http://www.jordantaylorpost.com/uploads/1/3/0/4/130492771/6025920.pdf
    • http://2minutesrestaurant.com/uploads/1/3/1/0/131071067/paxakixab_texaza_gopadi_dajena.pdf
    • http://elegantoccasionsindy.com/uploads/1/3/0/7/130739829/7b50b1a119.pdf
    • http://littlcandlepress.com/uploads/1/3/0/7/130740349/lisewezopimanulapatu.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_off00006d61.bin
3b2b94e685eb11753598565979cd24809cd204c6d74aeae18ddf9465f3f7c6d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D61 8732 bytes

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