Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a477c20fcbed785…

MALICIOUS

PDF

31.3 KB Created: 2020-06-02 00:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daa9a2a7791ec5eb058800636fa95a81 SHA-1: 1aafe8bb57e3d09cfeaf8eef7e9fa82f06ebea72 SHA-256: 3a477c20fcbed78546bf99aea21b738128dcc15c08113ac18af417b4c31f335c
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to similarly structured URLs on different domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a malicious redirection or content delivery scheme. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the document body and heuristics point to a link-farming attack pattern.

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://simixagplus.com/uploads/1/3/0/9/130969690/130969690.html#superior+auto+care+group
    • http://autodiscover.f8tailfitness.com/uploads/1/3/1/4/131453967/4599002.pdf
    • http://secure.aaoc.com/uploads/1/3/1/8/131871467/2202729.pdf
    • http://odiumrise.com/uploads/1/3/0/5/130551086/liwovagimidosi-kuwesob-ritelabijodat.pdf
    • http://media.shorelineapics.org/uploads/1/3/0/8/130814118/dadoripelumo.pdf
    • http://simixagplus.com/uploads/1/3/0/9/130969690/terms.html
    • http://simixagplus.com/uploads/1/3/0/9/130969690/dmca.html
    • http://simixagplus.com/uploads/1/3/0/9/130969690/policy.html
    • https://sabuninovaju.files.wordpress.com/2020/05/17278600893.pdf
    • https://fopuzenafo164646340.files.wordpress.com/2020/06/49730649015.pdf
    • https://migapilib.files.wordpress.com/2020/05/32000003905.pdf
    • https://ribixapisina.files.wordpress.com/2020/05/46711324742.pdf
    • https://melexiv.files.wordpress.com/2020/05/63429203491.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_off000050a2.bin
85dfc621ba66c24197bda1ca33db2290d03c5ab9e3f396300390ccd260456aab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50A2 9836 bytes

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