Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46020e876e4ed8b…

MALICIOUS

PDF

40.4 KB Created: 2020-03-15 00:29:39 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 133775bc28bb218f1bf7f3f381d9c0cc SHA-1: a4cf1acd6bb3a4366c20c1fcdb5930140300e5b6 SHA-256: a46020e876e4ed8bc8dc8e008032835f3e3d5ee548572ac7882faa52a1943d2d
94 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The document body, though heavily obfuscated, contains text suggesting it is a '4 hour body cheat sheet' and includes URLs that appear to be part of a link farm. The ML classifier strongly indicated maliciousness, supporting the assessment that this PDF is designed to lead users to potentially harmful content.

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://74-123-72-236.mgwnet.com/uploads/1/3/0/7/130775979/130775979.html#4+hour+body+cheat+sheet
    • http://www.genxtraining.ca/uploads/1/3/0/7/130738616/keroju.pdf
    • http://indycomicsexpress.com/uploads/1/3/0/7/130739684/pulawokataralokiz.pdf
    • http://livingthings.co/uploads/1/3/0/6/130639481/2eabb7f.pdf
    • http://pearlmanhattanmusic.com/uploads/1/3/0/9/130969598/xunokirewizasaf_xabazalegi_jomudo_genavawugu.pdf
    • http://nextstepsdaycare.net/uploads/1/3/0/5/130542908/7841639.pdf
    • http://handwork247.net/uploads/1/3/0/8/130814088/a8f7ea5a.pdf
    • http://morganschwarzphotography.com/uploads/1/3/0/3/130324440/1861772.pdf
    • http://www.freedom2you.nl/uploads/1/3/0/8/130873979/bad21408fc.pdf
    • http://southernoregonpressurewashing.com/uploads/1/3/0/6/130605519/sekigotasokakefebu.pdf
    • http://stakemywallets.com/uploads/1/3/0/4/130435835/9524729.pdf
    • http://daleslawn.com/uploads/1/3/0/6/130620976/furidilibu_zunosovukotonaj_sasenutuguj_tipamul.pdf
    • http://drmaryjoodom.com/uploads/1/3/0/7/130739640/rumejun.pdf
    • http://swcfamilyretreats.com/uploads/1/3/0/4/130489262/1962713.pdf
    • http://malamaphotobooth.com/uploads/1/3/0/6/130604729/8244490.pdf
    • http://dazluq.com/uploads/1/3/0/7/130775242/37275f58ad.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_off00007503.bin
89469c83190c0dc3a40614a30fd17bb9fa68603a94e56c372ec68843613ce2d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7503 8192 bytes

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