Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a6e6e5237b64d2…

MALICIOUS

PDF

36.2 KB Created: 2020-06-05 08:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 196adceffbb1bbc2fc4593db21234b6c SHA-1: 8a921b9bb368ac88bec84268709ba7ec98cf32da SHA-256: b9a6e6e5237b64d2ca62084610933ebdc34e63a80810efb2dd381c7f7c56b6e1
94 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents on different domains. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. The document body contains garbled text but also repeats some of the URLs, reinforcing the idea that the primary function is to redirect users to external content. The specific intent of the linked content is unclear, but the sheer volume and nature of the links suggest a link farm or a distribution mechanism for further malicious payloads.

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://andreawallacetheartist.com/uploads/1/3/0/8/130814014/130814014.html#totem+of+the+duck
    • http://sharpiguala.com/uploads/1/3/0/8/130813819/8446362.pdf
    • http://mx.pamlicoanimalhospital.com/uploads/1/3/1/0/131070332/gupixozer_varulijin.pdf
    • http://teamggc.com/uploads/1/3/0/3/130379347/sapidup.pdf
    • http://webmail.trvea.org/uploads/1/3/1/6/131606563/tofepuvez-lilunadiseda-wesukikadol.pdf
    • http://mobilewelding.shop/uploads/1/3/1/3/131383543/1019411.pdf
    • http://henryandersonreunion.com/uploads/1/3/0/7/130776539/9434430.pdf
    • http://mx.optimistsociety.org/uploads/1/3/1/4/131406153/rikigemodab.pdf
    • http://heatherjulien.com/uploads/1/3/0/3/130379625/fa12da.pdf
    • http://andreawallacetheartist.com/uploads/1/3/0/8/130814014/terms.html
    • http://andreawallacetheartist.com/uploads/1/3/0/8/130814014/dmca.html
    • http://andreawallacetheartist.com/uploads/1/3/0/8/130814014/policy.html
    • http://mx.optimistsoc
    • https://wefozeb.files.wordpress.com/2020/06/zodaterun.pdf
    • https://jagunijo.files.wordpress.com/2020/06/robunafudazaboko.pdf
    • https://kuwudine15385420.files.wordpress.com/2020/06/60401863334.pdf
    • https://povitavalis.files.wordpress.com/2020/06/womolewuvisizekedes.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_off000062e2.bin
b1a7f1061382a17b7d2590363891137b4843b3185f8da8f494125612f78527e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E2 10080 bytes

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