Malicious PDF — malware analysis report

Static analysis result for SHA-256 609465cb358a8e3c…

MALICIOUS

PDF

36.5 KB Created: 2020-05-14 02:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6ebaa40be39d63e2c185efdd00895540 SHA-1: 5b9f7481ca57f8d0452a073c84ac2941e47aceb2 SHA-256: 609465cb358a8e3c9a0e81c93b86346a1334c1470478e8a3ab22dcb66e7c6126
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body also contains a prominent URL, 'http://greyday5k.com/uploads/1/3/0/2/130289478/130289478.html#bus+rush+game++for+pc', which is likely part of a link farm designed to direct users to potentially malicious content. The ML classifier also strongly indicated maliciousness.

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://greyday5k.com/uploads/1/3/0/2/130289478/130289478.html#bus+rush+game++for+pc
    • http://pagemusicale-lfs.com/uploads/1/3/0/5/130540049/f75f44adf808da1.pdf
    • http://unicas.info/uploads/1/3/1/8/131871677/desigowaga.pdf
    • http://loscalifornianos.info/uploads/1/3/1/4/131406173/772444.pdf
    • http://nova-torg.net/uploads/1/3/0/5/130550748/fuwajowosebego-pevakajawumetaz-gapujaxowaf.pdf
    • http://michalasabnani.com/uploads/1/3/0/6/130603798/gamore_gaxilija_lupujeki.pdf
    • http://scaleupmanagement.com/uploads/1/3/0/2/130272452/zisufiwuwikakep.pdf
    • http://cabincrewrecipe.com/uploads/1/3/1/8/131856917/1180025.pdf
    • http://ima-roofing.com/uploads/1/3/0/6/130639510/rezopera.pdf
    • http://ashamandela.com/uploads/1/3/0/4/130478566/nuruni-xitareboduja-wizajokovubu.pdf
    • http://cleaningmaideasy.ca/uploads/1/3/0/5/130588389/sokovumunidadut.pdf
    • http://kpevolved.com/uploads/1/3/0/6/130604620/lafarugobaf-pulusek.pdf
    • http://memphisescaperooms.co/uploads/1/3/0/6/130639953/040af276056.pdf
    • http://rakkan4x4.com/uploads/1/3/0/6/130639605/tibuteka.pdf
    • http://agyearbooks.com/uploads/1/3/0/3/130323375/mapalodos_gonebadaxapi_nipafuz_jaruvadazilotim.pdf
    • http://omahafoodguide.com/uploads/1/3/0/9/130968960/sevixaludolosegemi.pdf
    • http://customgemcutter.com/uploads/1/3/0/4/130488743/porun_bawevodisujudo.pdf
    • http://teludynecustomshop.com/uploads/1/3/0/8/130874523/920144e1be9630c.pdf
    • http://wishuponastarcabaret.com/uploads/1/3/0/2/130289262/85f6f86da77e0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006402.bin
d6de69a61bd0e88f86505544d2eb559a75aa8e9470ce5052c6d9de46606f97ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6402 10088 bytes

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