Malicious PDF — malware analysis report

Static analysis result for SHA-256 f60a736a20b54036…

MALICIOUS

PDF

45.8 KB Created: 2020-10-15 20:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 61e7b9e8b918f006cc8fcaff7a9abe53 SHA-1: e348a5aba32ce1bc2631898d514b32d9f2927abf SHA-256: f60a736a20b540364506f981793e7f7db26d32bb914f0cbb91c24f0638f25be6
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm or SEO manipulation attempt. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to potentially harmful content or further malicious downloads.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.club/pify?keyword=uc+mini+apk+versi+lama In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368486/normal_5f882185e3012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5f885bfb4ae34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f87395f5b445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f871546f2f1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f877cfa35a5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f87c6c41c7cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_5f882f5be9676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f875cf5ed0a1.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/4810833.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/6467466.pdfIn PDF document text
    • https://site-1039610.mozfiles.com/files/1039610/64553000837.pdfIn PDF document text
    • https://site-1040665.mozfiles.com/files/1040665/kerisanesagozonija.pdfIn PDF document text
    • https://site-1044297.mozfiles.com/files/1044297/15031579809.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/numekutetolawepo.pdfIn PDF document text
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/guvirebozevis.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/modiketukilolusek.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/9927455.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e32f1e-5aa6-4028-902e-243e3a3a83a9/miwiporufaxerela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1288e786-9d16-4639-bddb-b616968a8ecb/pulutewejag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7ee10e-1dfd-4068-b48d-5a01c2d12761/zamudojafupewuvigojetipeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d883c52-d3f0-471d-b63b-8447c29b430a/36264184877.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55CE 5192 bytes
SHA-256: 7e1370f67e7856d06bb85cd0a5b41eae1eb222329adc617afd43c04be4e2ffd2
font_01_sfnt_off0000675f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x675F 2248 bytes
SHA-256: 4868153f5200892d8b9aa9611a808359786363d700a53a2c7677fa04903726c6
font_02_sfnt_off000071b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B4 10336 bytes
SHA-256: 1ff0198fd1769079216ec1c7a86fa0ed7f54c58b62c1bf3d14041956b7f6f4e9
font_03_sfnt_off00009471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9471 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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