Malicious PDF — malware analysis report

Static analysis result for SHA-256 1069d150f3a08f54…

MALICIOUS

PDF

41.5 KB Created: 2020-06-16 19:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c451406fd0c1420a5c78e66534e0ddc SHA-1: 0afe78a66aa4ae7c82ee525324b157e9c2a1f114 SHA-256: 1069d150f3a08f54aa9f6a88cf415c5c2d1f0ac1178f11b4fc56f118a69057bf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be SEO manipulation or potentially distributing further malicious content through these links.

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://rkeenerphotography.net/uploads/1/3/0/7/130775768/130775768.html#kindergarten+guided+reading+lesson+plan
    • http://haycockphotography.com/uploads/1/3/0/8/130814597/67f444270.pdf
    • http://realstudentcenter.com/uploads/1/3/0/8/130813132/3629268.pdf
    • http://grungygalz.net/uploads/1/3/0/7/130739747/maxosafu_vunojofe.pdf
    • http://dietsche.org/uploads/1/3/0/7/130775510/lodalajuxive.pdf
    • http://veteransforlife.net/uploads/1/3/0/4/130477309/buwujimisatetar.pdf
    • http://moaheq.com/uploads/1/3/1/8/131856039/mowubom-wazaxufakeme.pdf
    • http://lakeconroecontractors.com/uploads/1/3/1/4/131436983/penoru-kigiwara-momusijolilejol.pdf
    • http://okiedbz.com/uploads/1/3/0/8/130814169/wagoj.pdf
    • http://wolfecityhomecoming.com/uploads/1/3/0/3/130379049/vigira.pdf
    • http://behavioralspecialists.org/uploads/1/3/1/4/131453216/xitofetewuf_zemizevifatuna.pdf
    • http://giveartist.org/uploads/1/3/1/8/131856376/vimiruteluj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061f6.bin
1ff457fae50efa948810739fe64d7f0e8a3daea20f2bc292ec274e67b2bf0960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F6 4980 bytes
font_01_sfnt_off000072e8.bin
ae31459eac6d2e857adf6d949a9abcb5e96cec8560c3364084ca668ddc409b2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E8 11620 bytes

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