Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d30cefe8b840bd…

MALICIOUS

PDF

37.0 KB Created: 2020-09-14 13:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed082472923c8c568fe382242b663c1a SHA-1: 90bb96ba56c1deea7a62c3fd1beeb50e5475ff05 SHA-256: 16d30cefe8b840bdf476fa6b3b76f8081855378afd33299cf1ffacce0f8befda
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external PDF files, forming a link farm, and one prominent link to a known malicious redirector. The heuristic 'SE_MFA_LURE' suggests the document is designed to trick users into providing sensitive information, likely through a phishing pretext. The presence of embedded URLs and the ML classifier output strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 https://ttraff.link/wix?keyword=sony+vegas+pro+13+keygen+indir
    • http://files.ourhousecallvet.net/uploads/1/3/1/8/131857071/semosi-kimixasobal-baxokuw.pdf
    • http://bakob.alievarts.com/uploads/1/3/1/0/131070718/18a5a6df4f7d94.pdf
    • http://files.mauriceshapero.com/uploads/1/3/1/3/131381612/6257459.pdf
    • http://files.sinkutradiatorservice.com/uploads/1/3/0/7/130739032/53431e11ae06e.pdf
    • http://files.norcalholistics.org/uploads/1/3/0/7/130776485/3991bbddeec12.pdf
    • http://loxudi.archetypeweapons.com/uploads/1/3/2/6/132696021/dusivusagu-fegil-koferurisak.pdf
    • http://files.theequineadvisor.com/uploads/1/3/1/1/131163737/losokaf-jerapozezux-wiwoditux-xaxate.pdf
    • http://files.bonniegreenconsulting.com/uploads/1/3/0/8/130813876/76d7a5c5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0450/6717/4040/files/monthly_calendar_december_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/9993/9235/files/mobilcom_debitel_kndigung_vorlage_kostenlos.pdf
    • https://cdn.shopify.com/s/files/1/0432/5507/0880/files/37420270905.pdf
    • https://static.usrfiles.com/ugd/d4579c_3d8b092c10524672881df723336c1daf.pdf
    • https://static.usrfiles.com/ugd/9734e7_02b3c94649ec43fd87c6d1e20b0e1dad.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005197.bin
309ccd7c3fb578bc11ef1ccf6c88fa8dd13408d5f9f194e91e1e496918e20ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5197 5640 bytes
font_01_sfnt_off000064f2.bin
70542362655de9d5feb166a4c4cb88bfae8fbe8e44270ca327943d7a7e8201a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F2 10108 bytes

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