Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7e69c1ad1a9f1a…

MALICIOUS

PDF

40.4 KB Created: 2020-06-01 23:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ea61e652c99660258110cb2dbec1a11 SHA-1: 012af8fdbe3524d92d2b120af12e79d40d15e90f SHA-256: 7c7e69c1ad1a9f1a9468980395e0ef999bd8df8fcfa6ecc90e18fcb85d129ee8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body contains a reference to 'Britax b safe 35 car seat installati', suggesting a lure to disguise the malicious intent. The primary attack pattern involves redirecting users to numerous external URLs, potentially for SEO spam or to host further malicious content.

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://201.bpmtc.com/uploads/1/3/2/3/132303219/132303219.html#britax+b+safe+35+car+seat+installati
    • http://pratermarketingandmedia.com/uploads/1/3/0/6/130640095/1106673.pdf
    • http://en.concordiaball.at/uploads/1/3/0/6/130639797/2eac92.pdf
    • http://ryusushiaz.com/uploads/1/3/0/7/130776822/luxatokiv.pdf
    • http://webdisk.digitalcitizenshipinstitute.com/uploads/1/3/0/8/130874599/tixelir.pdf
    • http://gatewayhobbies.com/uploads/1/3/0/2/130288533/paxiranopolisigez.pdf
    • http://mta-sts.mail.voiceconsult.nl/uploads/1/3/0/4/130435794/2011889.pdf
    • http://mx.pitbullhill.com/uploads/1/3/1/4/131437508/sepow.pdf
    • http://blackwallstreetcapital.com/uploads/1/3/0/5/130542908/fawodevixil-xixarotu-robamafesobo.pdf
    • http://201.bpmtc.com/uploads/1/3/2/3/132303219/terms.html
    • http://201.bpmtc.com/uploads/1/3/2/3/132303219/dmca.html
    • http://201.bpmtc.com/uploads/1/3/2/3/132303219/policy.html
    • https://zosagadepug.files.wordpress.com/2020/05/pofefepi.pdf
    • https://texufugibat.files.wordpress.com/2020/05/xurawiv.pdf
    • https://tigeburilote.files.wordpress.com/2020/05/wafujufalepa.pdf
    • https://zamefapud.files.wordpress.com/2020/05/zikujudat.pdf
    • https://wuvenerige.files.wordpress.com/2020/05/43736937553.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_off0000707e.bin
3e8cf80bc58d4e1005142ded89e1f80401f0e433ab339f17a99793e10691927a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707E 11352 bytes

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