Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5c9b8a8f5fd4c5…

MALICIOUS

PDF

47.5 KB Created: 2020-10-19 11:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22fd4dfc67c58b3bfaa1c4c273247f37 SHA-1: 1bf973be33028fff0127c71fd63283ab7f537a78 SHA-256: 9e5c9b8a8f5fd4c593edda2bf590b535882f6942272c2928755ab0e353438b0c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with one prominent link directing to a malicious redirector. The document body, though obfuscated, contains text related to a 'Cocoa beach florida restaurant guide' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links indicates a potential SEO poisoning or link farm attack.

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://ttraff.link/123?keyword=cocoa+beach+florida+restaurant+guide
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/6247835.pdf
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/7250927.pdf
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/8995262.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3355978.pdf
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5f8b3e6232faa.pdf
    • https://cdn-cms.f-static.net/uploads/4369903/normal_5f8855e5a492a.pdf
    • https://cdn-cms.f-static.net/uploads/4373526/normal_5f8ce57a702b3.pdf
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/rotizizalipi-xulejowo-wegevok-xutijub.pdf
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/3275061.pdf
    • https://sowameneritela.weebly.com/uploads/1/3/0/7/130775755/javixokonojudebarum.pdf
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/b612eaae80.pdf
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/fizosudusozi_virirajam.pdf
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5f8863665dd37.pdf
    • https://cdn-cms.f-static.net/uploads/4377109/normal_5f8cef9e1de76.pdf
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/fotikilolusiregofif.pdf
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/wurogopijeza.pdf
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/vifotatilaw.pdf
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/5094659.pdf
    • https://zugufavowi.weebly.com/uploads/1/3/0/8/130874222/mudupoxodowen_fedibav_muxujis.pdf
    • https://fijojonibiw.weebly.com/
    • https://uploads.strikinglycdn.com/files/e95ec68f-958a-476a-9c32-8d8f48e97f1e/romajarunewebuzen.pdf
    • https://uploads.strikinglycdn.com/files/26313bba-6207-493c-917b-04c5f3908b17/26981886892.pdf
    • https://uploads.strikinglycdn.com/files/4545e839-e755-473f-b7fa-931da837698f/65339801281.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b03.bin
d0f1a9ab5313848f259ba4af9efcda31344f0f493d66d1f843dfd8d5959725d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B03 5328 bytes
font_01_sfnt_off00008d0e.bin
afd88708f882f9b08bb9ea506f1d41868b8161fedc17e8b9ccc1b2a222fb93cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0E 10364 bytes