Malicious PDF — malware analysis report

Static analysis result for SHA-256 7def59c4e19a37b4…

MALICIOUS

PDF

38.6 KB Created: 2020-10-02 16:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a1d384c357a146d00fac542d454a577e SHA-1: dbf9d8f4e41c1b0d7b9e98b53d3525a417f54e56 SHA-256: 7def59c4e19a37b4c0681887a3303696339ce5143a20b54bbe8220bc4c930d07
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files. The primary malicious URL identified is https://cctraff.ru/strik?keyword=vocabulary+cartoons+sat+word+power+pdf, which is likely used for redirection or to host further malicious content.

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://cctraff.ru/strik?keyword=vocabulary+cartoons+sat+word+power+pdf In PDF document text
    • http://files.llmoves.com/uploads/1/3/0/7/130739833/fomuzagibilupa-zogiluwafiral.pdfIn PDF document text
    • http://lapum.hanneliislarsen.com/uploads/1/3/2/7/132740449/1715673ee.pdfIn PDF document text
    • http://lemonan.melrosechurch.org/uploads/1/3/0/7/130739883/vumodibozizari-jutelipuxa-mofiso-sasuregegovuzu.pdfIn PDF document text
    • http://zifesaje.brilliantpropainters.com/uploads/1/3/1/4/131454762/dorabolaxixus_womarejunosupa.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/19751c14-10dc-45f5-a6d9-132c587c55b6/kufowimolor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f65aa5fc-9f98-4667-a4d4-7271e32dfbfb/wunewate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7336851-f927-4857-91f6-dc4609b9db0d/871239593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03cc82c3-c557-4de8-acd4-dfa934395385/pasokarunebilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc8916b6-3445-479f-a135-ce3ba80a0dac/kugikoxibuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba1743dd-656b-492e-9676-d967c626a647/kurafadezanikasidawol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/110e0b6b-5a3a-4505-869c-092cc3333d5d/11547145825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b991e14-7801-404a-a0bf-c4c587fff183/9677379875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5277356-73ae-4a06-8a44-6b53e0ad3278/noler.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_off000056cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56CC 5448 bytes
SHA-256: 27cdfd38b276d67db5fca0d065bc97e0bc5ecb36387ea1e6b0dad25618f5ee54
font_01_sfnt_off00006979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6979 10608 bytes
SHA-256: 62c332779865c0fe90855db20dd4bb69a10e7dde76993b1d485247072391f304

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