Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e158ac9fa2c88f2…

MALICIOUS

PDF

38.4 KB Created: 2020-10-09 01:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7ddb294a3bef73111e9c830b0c7f5bd3 SHA-1: a7eecc936be6b0a4495d927563e26fa0c6b7ed28 SHA-256: 3e158ac9fa2c88f263dfb25756fc4b0faf864b79ca592a237f28f0b312ce12fa
94 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that points to a URL likely hosting a second-stage payload. The ML classifier strongly indicated maliciousness, and the embedded URL is flagged as a known malicious redirector. The document body itself appears to be obfuscated or corrupted, but the presence of the malicious link is sufficient evidence 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://gettraff.ru/strik?keyword=%25D1%2583%25D1%2587%25D0%25B5%25D0%25B1%25D0%25BD%25D0%25B8%25D0%25BA+%25D0%25BF%25D0%25BE+%25D0%25B0%25D0%25BB%25D0%25B3%25D0%25B5%25D0%25B1%25D1%2580%25D0%25B5+10+%25D0%25BA%25D0%25BB%25D0%25B0%25D1%2581%25D1%2581+%25D0%25BC%25D0%25B5%25D1%2580%25D0%25B7%25D0%25BB%25D1%258F%25D0%25BA In PDF document text
    • http://files.thefrontpaige.com/uploads/1/3/2/7/132740405/kepukedamujijar.pdfIn PDF document text
    • http://files.dreambiztestdrive.com/uploads/1/3/1/3/131381612/wozuliwajebuko-gibuzi-bozag.pdfIn PDF document text
    • http://files.theeaglegallery.com/uploads/1/3/1/4/131437881/1a1d2240.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/4cd0ea17-9d5e-416e-a31e-9d85f7e9dee7/delowip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8a449f4-7d8d-47e7-9cc3-0e27b033cecb/vexed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2564/8797/files/where_does_macbeths_coronation_take_place.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4971/3817/files/discovering_nutrition_4th_edition_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2658/6522/files/13888834331.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1335/1835/files/dezudajalit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3130/0758/files/mit_heat_transfer_lab.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_off00004d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D03 6052 bytes
SHA-256: 55dde6d02aac8f784fbe610770629e9c3ff59198604043c3d5f1334e6b65efe8
font_01_sfnt_off00006144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6144 12844 bytes
SHA-256: 21791c44843c0e71850d559a29a4edac214d62f131134acc4a43f80bec408b18

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