Malicious PDF — malware analysis report

Static analysis result for SHA-256 0164fd511b92ed50…

MALICIOUS

PDF

42.4 KB Created: 2020-03-14 20:38:58 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 997cdf1a8719706ad66c0b77f80848c5 SHA-1: f1c8ee974e72ac695f373d3d24a2dc44b13f7764 SHA-256: 0164fd511b92ed50bb80a9cf82476355faa45f779f96b6bb789bcb8b024a2dc5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious Link

The PDF contains numerous external links, many of which are structured as a link farm, suggesting an attempt to direct users to malicious content. The presence of a 'download button' lure and the ML classifier's high confidence score further indicate malicious intent. The primary goal appears to be tricking users into downloading a second-stage payload, possibly disguised as a game client.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://r6mo1.salon225.com/uploads/1/3/0/5/130543816/130543816.html#maplestory++full+client
    • http://www.mydriveandearn.com/uploads/1/3/0/8/130813658/jabisenifi.pdf
    • http://webdisk.open-insurrection.com/uploads/1/3/0/6/130639034/kabewasugededexeko.pdf
    • http://ccsdcelebrates.com/uploads/1/3/0/5/130551206/2112739.pdf
    • http://autismawakeningllc.com/uploads/1/3/0/5/130538902/9562070.pdf
    • http://www.opmdemo2.com/uploads/1/3/0/2/130289784/8286687.pdf
    • http://winderswise.com/uploads/1/3/0/3/130379151/4435799.pdf
    • http://www.moodmetals.com/uploads/1/3/0/6/130640235/294248.pdf
    • http://kytephotography.com/uploads/1/3/0/5/130589000/widamabixu_vevawipis_gejazukivibomi.pdf
    • http://roadracewarrior.com/uploads/1/3/0/6/130621373/lozemin.pdf
    • http://minnesotaseoservices.com/uploads/1/3/0/8/130874395/2532305.pdf
    • http://realsaltshop.com/uploads/1/3/0/4/130435794/7585631.pdf
    • http://www.ajstonecare.co.uk/uploads/1/3/0/7/130738918/fevipububofezogefo.pdf
    • http://winchesterrobotics.org/uploads/1/3/0/6/130639884/c8da87b5f668bc.pdf
    • http://goldencacahouetes.com/uploads/1/3/1/0/131070918/b5802.pdf
    • http://bevingroup.com/uploads/1/3/0/7/130776577/kikixudamob.pdf
    • http://secretweaponstudio.com/uploads/1/3/0/5/130547613/lavosuledol.pdf
    • http://nerdbabies.com/uploads/1/3/0/3/130313038/1109913.pdf
    • http://were-nuts-about-mutts.com/uploads/1/3/0/7/130776046/9968591.pdf
    • http://augustachoralsociety.org/uploads/1/3/1/1/131164033/c0e9ee.pdf
    • http://androidguru.com/uploads/1/3/0/6/130604054/9948001.pdf
    • http://reword.games/uploads/1/3/0/6/130604922/4650536.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_off00007b60.bin
029871bdbe45e9c66398314fc906052d5d2a49406101dc44d906730072d7f164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B60 8524 bytes

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