Malicious PDF — malware analysis report

Static analysis result for SHA-256 795edcd3ca79279a…

MALICIOUS

PDF

46.5 KB Created: 2020-09-13 11:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 08260298204c2b2baca080ebf787e508 SHA-1: e4fc21707cfee2f33316a01c724eca6ec107fd26 SHA-256: 795edcd3ca79279a0f9e64d7f68b4421bf8bfc6629e19cc751eef5f4bf29c11b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to redirector infrastructure and a large number of other PDFs, indicative of a link farm or a distribution network. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'balancing redox practice worksheet', suggesting a social engineering pretext.

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://ttraff.link/pify?keyword=balancing+redox+practice+worksheet In PDF document text
    • http://files.naude.eu/uploads/1/3/0/8/130814258/4346797.pdfIn PDF document text
    • http://nanaxup.jansceramic.com/uploads/1/3/1/6/131607163/gefumix.pdfIn PDF document text
    • http://lejagite.mecaholland.org/uploads/1/3/2/7/132740343/razire-dunazise-rokifusukigoget-burarisomi.pdfIn PDF document text
    • http://files.warriorsofpurpose.org/uploads/1/3/1/3/131380944/789490.pdfIn PDF document text
    • http://files.videopeople360.com/uploads/1/3/1/3/131380547/jatiwufomixivepeguk.pdfIn PDF document text
    • http://files.preciouspawsboutique.shop/uploads/1/3/1/1/131163559/ce873254c3.pdfIn PDF document text
    • http://files.srvgermanschool.org/uploads/1/3/2/7/132712006/e2e316a3.pdfIn PDF document text
    • http://files.mrschristinab.com/uploads/1/3/1/3/131398184/venumukosej-sadomamu-pariduzuxato-kosuretelude.pdfIn PDF document text
    • http://files.highvariancegames.com/uploads/1/3/0/7/130739253/4ab392da99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/73c254_1fbfeb035fb14749adfd03951f3ee953.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/097bd5_e4dbf0930a91497ba2fd0c17c748f127.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/fd3290_2f85ead8079043eba15bf16fdf5884e0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3254bf_050ec30e39e74d33b388653f3e0731c6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6cfc61_991dc487ddd54e20a057102b11a8b64b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/24deb6_aa9629e2d29d48c1a9fa025fe21f793b.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_off00006ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA4 5608 bytes
SHA-256: 7f817d6d2837ad16bb986eaeb05b6095324ebd6009c7e720c8ae0b7b7290ac97
font_01_sfnt_off00007fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC7 14236 bytes
SHA-256: 3e3abb2999ce7e454c2b84e1ccf338abfaed2b64e0bded064e2d9bea553dd0b7

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