Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9345ff20eccee3e…

MALICIOUS

PDF

41.2 KB Created: 2020-10-31 01:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd398dad695bef40201e4f6b64c7ba69 SHA-1: 2a37432467b1c68455568592ff1cc32178cc68b2 SHA-256: e9345ff20eccee3ef35d005b8e29a56e421342ebf24fc80f262925035f04da3d
94 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL and text suggesting a lure related to 'worksheet answers'. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a malicious link embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=the+heart+cycle+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4379359/normal_5f9539c8ad30a.pdf
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f8db480bc0eb.pdf
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5f883ac2b5b88.pdf
    • https://cdn-cms.f-static.net/uploads/4386333/normal_5f90af595fc04.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lodunixodetum/telizulojipakik.pdf
    • https://cdn.shopify.com/s/files/1/0483/6281/5651/files/fbdown_video_downloader_apk.pdf
    • https://s3.amazonaws.com/jadudusujuje/20305003897.pdf
    • https://s3.amazonaws.com/xanebavifamopez/kindergarten_phonics_worksheets_beginning_sounds.pdf
    • https://cdn.shopify.com/s/files/1/0492/4044/0998/files/muscle_car_games.pdf
    • https://s3.amazonaws.com/jamokaroxoj/40975074113.pdf
    • https://s3.amazonaws.com/muxozuvalubi/tisikinofopa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006545.bin
9cd368cbdc37345ca5f8fb84fe62720e5baf9d0709ca0da4e92e6ae0e02c7c2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6545 5092 bytes
font_01_sfnt_off000076a8.bin
21357242444c0c4e9d02e91a9ee5d085e7f8dde53fdad7ab74bdc792561aeeb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A8 9816 bytes

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