Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef317e10387baf0a…

MALICIOUS

PDF

48.6 KB Created: 2020-10-16 07:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8de3e899f7981a1a8721cd3e54c078e0 SHA-1: 9610d48d9cc1a1d9669bc6a09053a21b981ed832 SHA-256: ef317e10387baf0abbc41937028669b322e1cc0b8a63a823b8755f0f3c3892a2
94 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'book folding patterns' and includes URLs, suggesting a lure to trick users into downloading potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/123?keyword=book+folding+patterns+free+download+pdf
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/bulivovajuzonabazide.pdf
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/medore.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/7d7b6617ab8.pdf
    • https://netulomite.weebly.com/uploads/1/3/2/8/132814473/nofuxebunem.pdf
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/koxepavadi.pdf
    • https://site-1041761.mozfiles.com/files/1041761/demonstrative_pronouns_worksheet_grade_5.pdf
    • https://site-1042785.mozfiles.com/files/1042785/92931410142.pdf
    • https://site-1045384.mozfiles.com/files/1045384/tavuvize.pdf
    • https://site-1039428.mozfiles.com/files/1039428/56513735391.pdf
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f88630bc136d.pdf
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f874273968c4.pdf
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f875f1519f1e.pdf
    • https://cdn-cms.f-static.net/uploads/4368494/normal_5f88bbc48ae23.pdf
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f889452d9a01.pdf
    • https://site-1039544.mozfiles.com/files/1039544/wovotiwazotuvikurade.pdf
    • https://site-1048486.mozfiles.com/files/1048486/54126955763.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/515bcce3-35cd-4d9c-886f-94c5631d489c/16784739573.pdf
    • https://uploads.strikinglycdn.com/files/70d25d09-1fbb-4ff8-b1f7-7e908626d103/fusokejarezazipatu.pdf
    • https://uploads.strikinglycdn.com/files/7202aec0-fa62-48c5-a956-f4e7f0f6cae9/66406485297.pdf
    • https://uploads.strikinglycdn.com/files/3defc159-3153-4789-a6db-9645b752321b/tesidofopep.pdf
    • https://uploads.strikinglycdn.com/files/d43933a0-2fdf-466b-9191-102c26aebce2/nofajudula.pdf
    • https://uploads.strikinglycdn.com/files/73759f73-7980-4f02-a521-468451154b10/69584730662.pdf
    • https://uploads.strikinglycdn.com/files/3a9b936d-4b1c-4229-b456-a88014c63dcc/rejevuvugexeva.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_off00007e94.bin
ac9f680b319d1e9a6952e121852bcddc80e70559672ee6679bbcfdca74c75e81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E94 5416 bytes
font_01_sfnt_off00009126.bin
6b50689ddb8fa9bc0317b2e12bd93896dff9c97a5b79c842005fdf8af602f6c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9126 10468 bytes

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