Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff7e80f7fcaec1d…

MALICIOUS

PDF

51.7 KB Created: 2020-04-19 01:40:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 936781deca146c672caae43a4b76d310 SHA-1: a2804bba02459310f9da3206676043d6375a3e4c SHA-256: 6ff7e80f7fcaec1d282f1f4df96282d2fac98da942c64ded2159f289a6739197
96 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'Wifi voip app for android' and embeds a large number of external links, many of which point to other PDF files. This behavior is indicative of a link farm or a mechanism to distribute further malicious content. The ML classifier strongly supports the malicious verdict.

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://thesoonernetwork.com/uploads/1/3/0/8/130873798/130873798.html#wifi+voip+app+for+android
    • http://tourismfieldlearning.com/uploads/1/3/0/5/130543141/fd72681e1.pdf
    • http://innovativesurgerycenterllc.com/uploads/1/3/0/4/130476396/sewose_fegukitadizar_lezagarulan.pdf
    • http://investimentiglobali.com/uploads/1/3/0/6/130604627/1fc9386cbe9805.pdf
    • http://youthfront.net/uploads/1/3/0/6/130604750/6622496.pdf
    • http://jbstyles.shop/uploads/1/3/1/6/131637477/dazoset_bitoni_jolemusit.pdf
    • http://cabletvinternetreseller.com/uploads/1/3/0/3/130323216/jokosefupukabuziw.pdf
    • http://snowyawesome.com/uploads/1/3/0/3/130379398/615023.pdf
    • http://yalaavenue.com/uploads/1/3/0/6/130604185/favimo_bujap_vujep.pdf
    • http://purplesparklefoundation.org/uploads/1/3/0/6/130604195/besosebabeguxi_nofekisukud_waguzo_jebamoluzazupis.pdf
    • http://hybridhealthcaresolutions.com/uploads/1/3/0/7/130738830/7124719.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://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_off00008b94.bin
cc2179563e34a701f8a01d5de61a74511a415dc54d25fe4f95cc2d49d562b808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B94 8572 bytes
font_01_sfnt_off0000ac80.bin
d963b675419b44a369a498517eaa71f1e33accd3bf697da8a557db7924a8b198		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC80 16068 bytes

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