Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdd557136f48006…

MALICIOUS

PDF

45.1 KB Created: 2020-10-29 12:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4f8254698f14ee2a5fcf47f4863ee9e SHA-1: 59fb28fc30cc3e338807b9f91f0d8e87eaabd315 SHA-256: 4bdd557136f48006f362b6442147433bedef7b567a387572f02159db2c08a371
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is designed to lead users to potentially harmful content. The document body, though heavily obfuscated, contains text related to tablet troubleshooting and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious.

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://gettraff.ru/strik?keyword=trio+10.1+quad+core+tablet+hard+reset
    • https://cdn-cms.f-static.net/uploads/4388272/normal_5f8d3ef5eb80f.pdf
    • https://cdn-cms.f-static.net/uploads/4383928/normal_5f8cb78c91395.pdf
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/tuzek-laruzite.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0266/8986/3867/files/waze_cge_android_auto.pdf
    • https://uploads.strikinglycdn.com/files/f7471602-93da-4e62-9898-5cef465323be/tajidazabaduru.pdf
    • https://uploads.strikinglycdn.com/files/5a8e5e09-c25f-4449-8b6b-60918f9f4b4b/bumibuzox.pdf
    • https://uploads.strikinglycdn.com/files/0d4cef09-7a31-4db8-b8cd-0b60f22f123d/55115628042.pdf
    • https://uploads.strikinglycdn.com/files/ee921ea1-e90d-445c-a95a-7f1977b2d779/60094130203.pdf
    • https://cdn.shopify.com/s/files/1/0478/0710/3143/files/vuxitobafunavutisifigazal.pdf
    • https://cdn.shopify.com/s/files/1/0428/8996/9820/files/sideline_2nd_number_apk.pdf
    • https://uploads.strikinglycdn.com/files/4de8fdae-66f5-4ed5-9225-41c96456e246/55939493277.pdf
    • https://uploads.strikinglycdn.com/files/14022472-f046-4a26-a67d-31dd94e0c16f/30626445888.pdf
    • https://uploads.strikinglycdn.com/files/c1283dbf-1b0e-4d19-b50f-62f135023162/26036192875.pdf
    • https://uploads.strikinglycdn.com/files/f115757d-f775-4c58-884c-67d8ede7cfd7/nefipitumeduxuwetej.pdf
    • https://uploads.strikinglycdn.com/files/84fcd41f-63a2-449d-845d-89bdca96820f/sutovanolagunaxamovi.pdf
    • https://uploads.strikinglycdn.com/files/5043b335-5285-4af3-a85f-11c24772b5b8/26637862985.pdf
    • https://uploads.strikinglycdn.com/files/6008caa8-af15-4de5-842f-fda47736fe23/77552329750.pdf
    • https://uploads.strikinglycdn.com/files/93593d5f-6664-44dc-9b0e-2a09b6d1e7ca/37201847447.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c4c.bin
db98c2e194822149ada4ded16b5da55d9df49f12914dc8077ba44050769f2486		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4C 5468 bytes
font_01_sfnt_off00007ed9.bin
ff757e3c6445710b1e931c38ac35c3406d8a6bf50686dd72ea6ff289d647e85b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED9 11428 bytes

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