Malicious PDF — malware analysis report

Static analysis result for SHA-256 c536a751b7d742ba…

MALICIOUS

PDF

32.2 KB Created: 2020-10-27 06:58:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c26407456a7c3e9ea03c18c79d7f84be SHA-1: b2283d88c25daeb64232c887be57ab429b086822 SHA-256: c536a751b7d742bae648b814a74259d3dd25f01f8ae67fbaf15632b2eb895001
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by an ML classifier and contains a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains the URL https://cctraff.ru/wb?keyword=olympus%20endoscope%20manual, which is also flagged as a malicious redirector. The PDF's structure and small size suggest it's an image-based lure designed to trick users into clicking the embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 32 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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/wb?keyword=olympus%20endoscope%20manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f8caed178397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f90308fb5484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420034/normal_5f972ebf0f27a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5f8c245ede905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424341/normal_5f97654cc07b1.pdfIn PDF document text
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/bc998.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/a3d7e1ca7523529.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9448/2330/files/balancing_chemical_equations_using_algebraic_method.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4469/8272/files/xekede.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2069/8268/files/rawivamojasaxibunop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/bamij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8385/2695/files/van_turkish_city.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a254e21-2be9-4c19-8e9c-99ed0749467c/sukikane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9a80990-5b72-4700-87e4-8cbf2ac82a63/pro_android_games_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae49312d-d831-4640-943c-2d487e0e05cb/used_vw_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eef68a4-a9f0-4058-ad50-834c722ab2fb/contemporary_political_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a125af-1cd9-47de-9aa2-bdc9c85f72e7/15691723414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5514de5f-cce1-4b54-8330-8f139e205d4f/78598801085.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/7152/6854/files/braun_high_speed_thermometer_prt_1000_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/1134/2242/files/13_18_-_5_8.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_off0000483f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x483F 5252 bytes
SHA-256: 2ee5f86b342704da6f269658a25aa1dcfd9be5f9fb9b3c59f2653e5559225e81
font_01_sfnt_off00005a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A08 7548 bytes
SHA-256: ba7d106dc55d021c311cad3a8575947735024d769f94286c9d50fffdedf3015e

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