Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8526ff250a3e79…

MALICIOUS

PDF

37.9 KB Created: 2020-06-05 16:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fc505c356a923562df45ae7f2a144a1 SHA-1: 9d774f8bb241c697d99e47af324c5290735e441c SHA-256: fb8526ff250a3e794d462d6bfa8542a8a16f2dd0a50968863942f79221de06ef
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains structured for SEO spam. The ML classifier strongly indicated maliciousness. The primary purpose appears to be redirecting users to a network of websites, likely to serve malicious content or engage in SEO-based scams.

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://juicyscoopobsessed.com/uploads/1/3/0/5/130588931/130588931.html#orton+gillingham+worksheets+pdf
    • http://autodiscover.seethejoy.net/uploads/1/3/0/3/130379101/letojejagaw.pdf
    • http://adtest.site/uploads/1/3/1/1/131164032/ac4bf2a0a0d.pdf
    • http://makingitfromsunuptosundown.com/uploads/1/3/0/7/130775071/5605598.pdf
    • http://shearwaterwarmbloods.ca/uploads/1/3/0/4/130477278/dexokala_sefunuzabisuw_zigadewoka.pdf
    • http://themusicdepotcanada.com/uploads/1/3/1/4/131482997/6155829.pdf
    • http://74-123-76-54.mgwnet.com/uploads/1/3/1/6/131636806/1374415.pdf
    • http://autodiscover.cakeballsforacause.com/uploads/1/3/0/6/130603731/1831.pdf
    • http://affinitycleanco.com/uploads/1/3/0/6/130604151/kajugawujufizuje.pdf
    • http://theagelessfactor.com/uploads/1/3/0/2/130289610/3e08c9717b5423d.pdf
    • http://juicyscoopobsessed.com/uploads/1/3/0/5/130588931/terms.html
    • http://juicyscoopobsessed.com/uploads/1/3/0/5/130588931/dmca.html
    • http://juicyscoopobsessed.com/uploads/1/3/0/5/130588931/policy.html
    • http://juicyscoopobsessed.com/uploads/1/3/0/5/130588931
    • https://biwuliru.files.wordpress.com/2020/06/muxorubujakotegozi.pdf
    • https://lafukaraziba.files.wordpress.com/2020/06/70393988382.pdf
    • https://pesumiza.files.wordpress.com/2020/06/pekivake.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_off00006900.bin
38ff6eba2c3c29a0eef608af9b5f30dfef2563a6bac87497281ea8e481cf1725		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6900 10132 bytes

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