Malicious PDF — malware analysis report

Static analysis result for SHA-256 49eb7c4644c3c1c1…

MALICIOUS

PDF

49.4 KB Created: 2020-10-29 23:03:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 45cdfe8718b2fa4f8bee653e8cda1383 SHA-1: 9fa37af40bfb148061d62c027aa407734252cb72 SHA-256: 49eb7c4644c3c1c1c5bd4e617160d8f1652110cf8dccb68e9d8b42a6323be4e6
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded link pointing to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL and keywords suggesting a lure for a 'recovery flasher apk'. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious link indicates an attempt to redirect the user to a harmful site, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.com/123?keyword=recovery+flasher+apk In PDF document text
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/rewasuwapuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_5f9465d2534f6.pdfIn PDF document text
    • https://dofuliral.weebly.com/uploads/1/3/4/3/134346813/2453774.pdfIn PDF document text
    • https://guboriratuji.weebly.com/uploads/1/3/4/2/134235556/ca06bc9bb1.pdfIn PDF document text
    • https://vivazezege.weebly.com/uploads/1/3/4/0/134041722/wotaru.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/fopalew/guxoxanogovivizos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/976a1d34-3d37-400d-847f-fa475755fba5/531163580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3855ec4-53ef-4e7c-adf5-f0c8f168f870/jejifik.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/norman_topping_scholarship_autobiography.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/29517462180.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/aliran_filsafat_humanisme.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/arcgis_spatial_analyst_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a4b3982-a730-4d7e-b58e-72071525b2ee/formedium_autoinduction_media.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc2f6bb-b250-41b3-9d2d-2b41df1f8a72/78727647048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0375f2-38fc-4b6d-978e-289d69db44e2/wenodetuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ce1982-cf79-40e3-8586-e2192d4aaba4/imperio_bizantino_exercicios_resolvidos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6952 5336 bytes
SHA-256: 9d18f8983611bc5e4ac593dc3264a1e543acf18815a05208e0dba1449fdc1bab
font_01_sfnt_off00007b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B85 11880 bytes
SHA-256: 0be9e97eea7c28b2ce0265cc11131c89ece81ebba466989917d4b7eaa25fe976
font_02_sfnt_off0000a38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA38D 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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