Malicious PDF — malware analysis report

Static analysis result for SHA-256 8842bc8df11f95bd…

MALICIOUS

PDF

45.7 KB Created: 2020-09-10 01:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03a842c104d5a0bc1cbaf7f2f6e30df7 SHA-1: 9372d63338e96118e7c0337fae6bf4576b08cdd3 SHA-256: 8842bc8df11f95bdc190c2c40d2cb53c25a9294b8b59538e7661b945023cf378
162 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to a link farm designed to host other PDFs. One of the primary links, presented as 'mpsc rto exam question papers pdf', redirects to a known malicious domain. The ML classifier strongly indicates maliciousness, and the presence of a download button lure further supports a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/wb?keyword=mpsc%20rto%20exam%20question%20papers%20pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://static.usrfiles.com/ugd/f17c08_5bdd2b500c28410c8e2d8dbcdf26cb46.pdf
    • https://static.usrfiles.com/ugd/0c41e7_8a20ac5b38c2498d99ade6f074d4337f.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_6bffdda8c6184791a788430e7c7c3c5b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c190173c940b48559d2cda89728aa1a2.pdf
    • https://static.usrfiles.com/ugd/c75f60_fc4a865e3d1e4ba89dfaf33800e4814c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5604d5f2d7741efba6f247756932ddc.pdf
    • https://static.usrfiles.com/ugd/5ea4d5_c5813e08419f43d7ba93779085c9ccf9.pdf
    • https://static.usrfiles.com/ugd/8b49c6_28d1ef7e129845e8b2efceb00709854b.pdf
    • https://cdn.shopify.com/s/files/1/0431/8507/8434/files/negadavogumepagif.pdf
    • https://cdn.shopify.com/s/files/1/0435/6158/2755/files/best_minecraft_mods_1._14.pdf
    • https://static.usrfiles.com/ugd/0d089b_ade068e6f74647718873fedef44bb984.pdf
    • https://static.usrfiles.com/ugd/89c6ad_f633565e119e4c25ac783a476b4930bf.pdf
    • https://static.usrfiles.com/ugd/7ff653_8471569d194e481ebd25d3b83fb2244f.pdf
    • https://static.usrfiles.com/ugd/d2057d_68aa5b078fab476e8b73c83bc6358fe2.pdf
    • https://static.usrfiles.com/ugd/b5973a_5dbb4053ad3f4a879c960ae3fa86df6f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d57.bin
3b309c3c06226eadbd903fd518b565b1056ebcea100e07293b7c2f074bca22cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D57 5468 bytes
font_01_sfnt_off00006fe7.bin
152eeff807dc1f418218c647d77110afce7c098de0295a83ae1f13e0da70b02c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE7 9976 bytes
font_02_sfnt_off00009224.bin
a593f7fcae964024530bdddc4c9e38eab4fb292418fb768a0794f7a00b37c46b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9224 6236 bytes

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