Malicious PDF — malware analysis report

Static analysis result for SHA-256 9741b83c2f426ff5…

MALICIOUS

PDF

41.0 KB Created: 2020-11-02 08:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8916f0e0b457880aef2b12b055bfb67a SHA-1: e3f072dcacceca8d28af4e64fa1fe6630f2c0648 SHA-256: 9741b83c2f426ff58480bb30ccdd01e80a0d746480a2f876ffcb9c1d75057675
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a redirector URL that is flagged as malicious. The document body, though heavily obfuscated, contains text related to an 'iPhone 7' and the malicious URL, suggesting a lure for a phishing or scam campaign. The ML classifier also strongly indicated maliciousness.

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.me/123?keyword=iphone+7+answer+call+without+sliding In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_5f8a2e403cf85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f91205476d4e.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/11270e0d-1bc7-4f6d-96bf-d3281432e999/wakumexubuwotuwalamosewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1508050a-4d00-4830-bc70-ec7a3bb4374c/kavede.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2889/6674/files/fgo_event_farming_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b6ccda-b261-49ac-b708-0b4932aa6083/1994376329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc964bad-3411-45ff-b085-8195a10a4f11/34104465599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6139285a-7cf8-41aa-839d-f78b650844e6/15098322200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e3be66b-270b-4a29-882a-7112b071e716/zefaputas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4463/2257/files/passive_voice_two_objects_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1438b3b5-7aa6-4b45-985c-98383830fbe6/secretary_of_state_illinois_dmv_jobs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7738/5368/files/rubber_feet_for_chairs_rectangular.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1570/6523/files/sedasabedosubi.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_off00005e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E51 5444 bytes
SHA-256: ac0b09f9ab35d10a46a0497d80e05c8f25d981f107326c1898c80aebf71ccbd3
font_01_sfnt_off000070e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70E3 11404 bytes
SHA-256: f03cf60b18f283e753f550740909ebe136dad6ee93142c3a455b1d8f383c754c

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