Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19b340fc5306f98…

MALICIOUS

PDF

40.3 KB Created: 2020-11-06 18:34:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ed482f70bb9ef226287739aac7e0000d SHA-1: ec3e4fbef89133dcc29b43aaaae24a4925336855 SHA-256: f19b340fc5306f9840d09ad342d5114268ab7cf61f27f8b06ff0ddb8bc5b5854
134 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, indicating an attempt to lure the user to a harmful site. The presence of a heuristic firing for 'LOLBin token sequence in document text' suggests potential script execution, likely JavaScript given the PDF context. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://traffking.ru/aws?keyword=piano+app+pc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410199/normal_5f95ff7ea4896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_5f8a684f9019f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5fa552daf1d17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417414/normal_5f9adb16b067b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_5f94d0dbc6ed3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/74249370118.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/22055372206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/935fb763-6c6f-4d5d-98ef-be1c0958a70e/dariwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/860d8d61-f393-40fe-8c96-96ed9158087c/88753640572.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/walkthrough_for_40x_escape_level_24.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/best_architect_portfolio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92c45bd1-5f1c-4d4e-aed3-07694ea07f6f/98194028553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eea7fad-f50b-4ce3-ab25-63eef85bcf96/93303953482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fb16982-4043-4807-bbb6-a96a18fac268/79980193277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3866967f-4c7e-46bc-a63d-9337b608987c/dibakusotumutopos.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6061 4620 bytes
SHA-256: be359b70e7621f8de356d68922caca8a798a1fa318cbb8a009860758a0a688bc
font_01_sfnt_off00007032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7032 10800 bytes
SHA-256: 9d754709fd53d90b96dbe62f2a83e0d88a3270241d112e00eb7618335b66379b

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