Malicious PDF — malware analysis report

Static analysis result for SHA-256 6542cca639f51901…

MALICIOUS

PDF

41.7 KB Created: 2020-10-24 11:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: d150a1684eea64595b0d5236cb3bf659 SHA-1: 8ae5d945fea15cdfbe449d0efaaabeb909a38e75 SHA-256: 6542cca639f519010b736e59cca1fa8c4972c7d6e34237400b45807f37aeef42
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, cctraff.ru, which is disguised as a poem summary. This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or scam attempt. The document also contains a large number of links to S3 buckets, likely part of a link farm to improve search engine ranking for 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/wb?keyword=philomela%20poem%20summary%20pdf In PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/bb429d.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/d1672311.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/subud/43543530323.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/wejop.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/xuduvemajetubadajob.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/balarama_malayalam_book.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/82772320883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f32f77-0288-462f-af95-1f604f96e114/the_making_of_a_poem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5459ddd-e141-4ec9-8dc1-3c99d694e2e0/60396765838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b27d52c-4236-480a-a612-3456ba94a7f8/dodajuxalolumefeguniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea64f040-017e-459e-a657-fe540f303ca0/posufoniro.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/76940377974.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/kujubipaveju.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/49236583216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b06c37-8dcc-41f6-ae95-8f856cb86171/2008_subaru_impreza_service_manual_p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf462a63-ed6f-4648-bacb-17f0c3aa8795/2099252965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca386e6-37bf-4f83-a059-75c2f13ef303/43631224978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8059ec47-b4be-4841-94d0-c726d7ec78fa/roxefake.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_off00006634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6634 5384 bytes
SHA-256: 0f52d8d2da01607994ee23bded59404b45152e8f0a231286d97615bb1c9eaf54
font_01_sfnt_off00007857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7857 9896 bytes
SHA-256: 785ca61c8a10c081e29c2c95aae297ffca287992e578b2f634378fccdfbb6cd1

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