Malicious PDF — malware analysis report

Static analysis result for SHA-256 010da1b98b706bae…

MALICIOUS

PDF

42.7 KB Created: 2020-06-03 23:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f24763a9ea659133ffdae9a591fe0ea7 SHA-1: ac4ddb6c021440c52bf8e3a45409f21495994542 SHA-256: 010da1b98b706bae2b4d910c290dd92fcd15d1123ceb0d8901b9769e033056e7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are structured as numeric slugs, indicating a link farm for SEO manipulation. The document body references 'Elder Scrolls Online stuck on updati', a lure likely intended to direct users to malicious websites hosted on domains such as cmanmedia.com and secrethistoriesbook.com. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://cmanmedia.com/uploads/1/3/0/8/130873902/130873902.html#elder+scrolls+online+stuck+on+updati
    • http://secrethistoriesbook.com/uploads/1/3/0/4/130435520/nuzib.pdf
    • http://thewackywallaces.com/uploads/1/3/0/6/130639746/padewokem.pdf
    • http://bigcitystrangers.com/uploads/1/3/1/8/131857120/231158.pdf
    • http://mx.autoescuelademanejo.com/uploads/1/3/0/6/130640040/dasafapinolob.pdf
    • http://webdisk.speech4kidz.com/uploads/1/3/0/7/130739068/nekiwakesivo.pdf
    • http://writeaboutmusic.com/uploads/1/3/0/6/130604152/393115.pdf
    • http://mail.markbrewer.com/uploads/1/3/0/4/130436242/5632754.pdf
    • http://shoesmenm1.com/uploads/1/3/0/6/130621376/2291084.pdf
    • http://cmanmedia.com/uploads/1/3/0/8/130873902/terms.html
    • http://cmanmedia.com/uploads/1/3/0/8/130873902/dmca.html
    • http://cmanmedia.com/uploads/1/3/0/8/130873902/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dekupuwapo627084595.files.wordpress.com/2020/06/finasadadumufuwubowaxex.pdf
    • https://kenubid.files.wordpress.com/2020/06/xudixinewufiz.pdf
    • https://mufobug.files.wordpress.com/2020/06/rikugonukukakagilonuvoduj.pdf
    • https://pafekuka479092809.files.wordpress.com/2020/06/mopiwusorowegoniwedebu.pdf
    • https://jixozab.files.wordpress.com/2020/06/minekebuxot.pdf
    • https://lidunipate.files.wordpress.com/2020/06/kelipurabefabugawexaxi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000631b.bin
43777ee634e2650e7f984eda1f9847f9228b80b05188821e974128ced38b07c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x631B 11336 bytes
font_01_sfnt_off0000897c.bin
95bdf1e51c91a347532f4b179d39af09e29107d578526feb1362f61cac632cad
pdf-font-stream PDF embedded font (sfnt) at offset 0x897C 16232 bytes