Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b851f859d062647…

MALICIOUS

PDF

36.3 KB Created: 2020-10-05 05:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9a174a8b67352547c2394c8c05af5e11 SHA-1: 782dab590ce87fec2ac1d82e0f0ec1b5ca08724c SHA-256: 1b851f859d062647b59da480752525f7b7c9dcfe5106cdf35a484c7cbb676899
94 Risk Score

Malware Insights

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

The PDF contains an embedded URL that points to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to lure the user to a harmful site. No scripts were extracted, but the presence of a malicious redirector URL is a strong indicator of malicious intent.

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://cctraff.ru/pify?keyword=rustoleum+auto+paint+blue In PDF document text
    • http://files.exponentialgoverning.com/uploads/1/3/1/3/131380558/a5854.pdfIn PDF document text
    • http://bajula.thissiteisunderconstruction.org/uploads/1/3/1/3/131383483/dusumopabijaw-kanenude-puvirezaguwab.pdfIn PDF document text
    • http://files.sydneynewhorizons.org/uploads/1/3/1/3/131381605/mafajepumipuzegazasi.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/9e957813-af06-42c3-b01c-379b3112b70e/7543559315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/676ca990-b0d4-4b2a-bf83-8b09b8a84b26/37798142431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed55528-6be1-4782-a34c-0eaee4f82c68/14496524955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d723e34a-96af-4a7e-904a-22ba671229f5/37512305847.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7862/4426/files/yatse_unlocker_legacy_apk_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4138/0769/files/immersive_weapons_skyrim_se.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1643/2027/files/world_warcraft_movie_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1760/0156/files/rirogimobafakugedaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9113/0536/files/salaxipumaxusenukixufoni.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_off00004fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FD3 5016 bytes
SHA-256: 4a2d1a821cdd9fdb2d41f68071154f4d8fc705dc0d5f73e76f507e75d9fcccb8
font_01_sfnt_off000060cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60CF 10088 bytes
SHA-256: b28f4fa0faad1e953934763623ae758025cbff4093998456a36e10f5dc7f9280

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