Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d425681ac2a584c…

MALICIOUS

PDF

43.2 KB Created: 2020-03-21 14:14:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 38767ad722685105dbbe8982a7fcd2e8 SHA-1: 520e39ad82b24ddaf970b71daaa8dda485a35565 SHA-256: 1d425681ac2a584c0181f15bd0721c09d289fa39bb79c60a4fd8744b3c338b29
94 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body, though heavily obfuscated, contains URLs that are also listed in the extracted URLs, reinforcing the attack pattern.

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://slbconsultingservices.com/uploads/1/3/1/0/131070723/131070723.html#traxxas+rustler+xl-5+aluminum+parts
    • http://www.errandboy.com.au/uploads/1/3/0/8/130873842/c12797f01c102a.pdf
    • http://angelfieldheirloomtomatoes.com/uploads/1/3/0/6/130622036/gudexoja.pdf
    • http://pmoist.com/uploads/1/3/0/4/130436141/madagodumureb.pdf
    • http://breakingbadhouse.com/uploads/1/3/0/3/130323914/06250.pdf
    • http://rorymc.ca/uploads/1/3/0/8/130874299/2853062.pdf
    • http://downtoearthdrones.com/uploads/1/3/0/4/130435862/d8264.pdf
    • http://www.alaynestrategies.com/uploads/1/3/0/2/130272582/libel.pdf
    • http://umidigitalinnovations.co.za/uploads/1/3/0/5/130589020/1695831.pdf
    • http://alreadywednesday.com/uploads/1/3/0/2/130289334/junagipisim_tawakajufavi_kixewasapitomiz_wumunaxomowala.pdf
    • http://300wyandotte.com/uploads/1/3/0/4/130435702/zodix.pdf
    • http://lovelylook.net/uploads/1/3/0/5/130539251/060af1.pdf
    • http://4thandunion.com/uploads/1/3/0/6/130622116/0766085a12159f.pdf
    • http://kgmakingthecase.com/uploads/1/3/0/5/130590367/zufapadovujajew.pdf
    • http://www.pointcookhealth.com/uploads/1/3/0/5/130540021/xofurufu.pdf
    • http://sublimationwholesaleblanks.com/uploads/1/3/0/4/130483205/269445.pdf
    • http://myaceinc.com/uploads/1/3/0/8/130813395/rimes_pejapejosoxar_vudufel_ruvowitax.pdf
    • http://nuevavistamenorca.com/uploads/1/3/1/0/131070173/bd895a.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_off00007f86.bin
86fcc87dd0dd24cf366a2bf649b4e35123d8e50622b584d04430b05962781d33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F86 8260 bytes

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