Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d0b8efbb0c8620…

MALICIOUS

PDF

48.5 KB Created: 2020-11-08 14:23:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7a66b2dfc5734e6f7c4d27fd2158e37 SHA-1: 749bb4465351cb4413b41ccf4c114bed31078bec SHA-256: 88d0b8efbb0c8620fc4d19a78893242bef4baf4ab64c59e282d764d77e5b3568
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Weebly-hosted PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://traffset.ru/aws?keyword=gameboy+advance+emulator+for+pc+apk', is presented as a search result, likely to entice users to click and download a malicious payload. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for containing a mass external link farm.

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 https://traffset.ru/aws?keyword=gameboy+advance+emulator+for+pc+apk
    • https://nixejovebomir.weebly.com/uploads/1/3/1/3/131380485/vadus.pdf
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/tujimuxegexug_mekikizo_towekarevi.pdf
    • https://sipexagugiresu.weebly.com/uploads/1/3/4/6/134607427/rekagarid.pdf
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/9566599.pdf
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/menedo-fodizelusekom.pdf
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/suvib-labifoxorisod-wevakimilirori.pdf
    • https://cdn-cms.f-static.net/uploads/4408355/normal_5f924429bb785.pdf
    • https://betoxugibujimiv.weebly.com/uploads/1/3/1/0/131071043/kenebazedotak.pdf
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/5c6ad5c.pdf
    • https://kalabuzamebuku.weebly.com/uploads/1/3/4/3/134339718/d74330c300394.pdf
    • https://baxolelal.weebly.com/uploads/1/3/4/6/134625426/suxejikujowegev.pdf
    • https://cdn-cms.f-static.net/uploads/4465136/normal_5fa7a31253557.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/baxadelefofibuz/subexebajoje.pdf
    • https://s3.amazonaws.com/tanikanaw/lujaderogeviwinupo.pdf
    • https://nopebukivaw.files.wordpress.com/2020/11/89649154479.pdf
    • https://tovijid.files.wordpress.com/2020/11/91630450751.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000672c.bin
ac61c1f3d99f3061fe5a2235a61acd86e5d349199877d9c608f647a4d11d5253
pdf-font-stream PDF embedded font (sfnt) at offset 0x672C 5520 bytes
font_01_sfnt_off000079eb.bin
c88bb3b02ca1f51a52118901cb53666f36f996256dced741922c79c6d6e34022
pdf-font-stream PDF embedded font (sfnt) at offset 0x79EB 10956 bytes
font_02_sfnt_off00009fc3.bin
2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174
pdf-font-stream PDF embedded font (sfnt) at offset 0x9FC3 16144 bytes