Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd22632d9eaae85…

MALICIOUS

PDF

51.7 KB Created: 2020-10-17 20:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d5da31799cc3344e72ce4df3e1e89257 SHA-1: 5255c205832af913b042524a802a6a6ce0db0eca SHA-256: cdd22632d9eaae85148af34eab86c8612e1f6c70cb35c0fbae631cadf348f694
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are also present in the embedded link farm, suggesting a coordinated effort to drive traffic to potentially harmful sites.

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://gettraff.ru/123?keyword=recursive+formula+for+arithmetic+sequence+worksheet In PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/8279037.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/tusog.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/bosilo_ginasesif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f8730fb1f588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5f87182dd68a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5f873936404dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_5f88f1727bb3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380210/normal_5f8aa63f1920b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f874624b14ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f88f86957fab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f8746fd9a535.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/1/0438/3866/8965/files/wings_of_fire_graphic_novel_5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2500/5206/files/special_charcter_lol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6223/1201/files/fapubalegozemorawikasu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8081/9887/files/symbolism_in_the_scarlet_letter_chapter_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/8189/2509/files/kolal.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000620e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x620E 5820 bytes
SHA-256: 3444397321ab7afe11c7fa584c90842084c3cceb4bee5c823d17d8978def890e
font_01_sfnt_off00007714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7714 5472 bytes
SHA-256: d14597ea5d13f27d03e82ba0bc0a3be9415013e7080083333634207983a40b97
font_02_sfnt_off000089a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89A7 9960 bytes
SHA-256: d422ec200ee86c78839dcf203c9df2c6d6fb07cf0b78a341e48ba9e20a348af4
font_03_sfnt_off0000abfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABFD 16084 bytes
SHA-256: 249651805b0a8f5b4743f17da7e3943b18be49f9c75a96c0f18a2f62b87e55bb

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