Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92e5ac1c520b929…

MALICIOUS

PDF

51.2 KB Created: 2020-10-29 22:42:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 32c7f6d259b0516bcb517dc51c1681a8 SHA-1: 75e0efecbfbded614b2b37feb788684d4df1b6bd SHA-256: d92e5ac1c520b929ea1efd8a859fd571b9a14da9231147b793ed61b6db633a1e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector identified by the heuristic. The presence of a large number of external PDF links suggests a link farm or a method to obscure the true malicious destination.

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.cc/123?keyword=fundamental+trig+identities+practice+problems In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408704/normal_5f94a7797bdb9.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/6323409.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/wepokivaw_wokeve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385424/normal_5f91bc218b3b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388412/normal_5f8dfe4fc480f.pdfIn PDF document text
    • https://sakeneri.weebly.com/uploads/1/3/4/3/134339958/082bc16cd59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408482/normal_5f99173107eb4.pdfIn PDF document text
    • https://fopimakalegej.weebly.com/uploads/1/3/0/7/130738542/4280757.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/1/0496/6891/5353/files/apple_ipod_nano_8gb_instructions_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b871a397-9ad0-4146-a9dd-ef3527411315/38073998785.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4606/3258/files/download_spotify_apk_ios_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0588/5090/files/information_system_objective_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63618125-c929-400a-8309-e0588bd441a8/5866908006.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0538/6647/files/nokia_6_launcher_apk_xda.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_off00006fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA1 5488 bytes
SHA-256: e57cf19ef54e393ceab14d6ed20de871bd638f14ebc95aeace3ff8fc87e34d0e
font_01_sfnt_off0000822e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x822E 11536 bytes
SHA-256: 7b7205c23cf038d2a4f18ae0aff900b44019311ac1ff2c9d03a0bf445ce630b7
font_02_sfnt_off0000a8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A9 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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