Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b5c8a8a8af2eaa…

MALICIOUS

PDF

50.5 KB Created: 2020-09-30 00:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f770f7e9f7f6fd724bdc30805668548 SHA-1: 174b884408e27d27896b11b20d5e4c29e8f3bf02 SHA-256: a2b5c8a8a8af2eaa1813a639d705f5258fc0cea7e348682729756cbd4abf7248
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ggtraff.ru/strik?keyword=anlage+av+2015+formular+pdf', which is flagged as malicious. Additionally, the PDF is identified as part of a link farm, suggesting a coordinated effort to distribute malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ggtraff.ru/strik?keyword=anlage+av+2015+formular+pdf
    • http://files.animasfire.com/uploads/1/3/1/4/131454696/silame_kopigofitad_roluxi.pdf
    • http://ravif.zhuyuejia.com/uploads/1/3/2/7/132712615/nuvozanotow.pdf
    • http://files.treeoflifetroupe.org/uploads/1/3/1/6/131637723/donirimiwiti.pdf
    • http://gepiwugif.minjin.co/uploads/1/3/2/6/132682235/riforol_xadufuxilotez_sozevuwigow_xeriwanazexij.pdf
    • http://files.nowwhat-services.com/uploads/1/3/0/8/130873996/9911424.pdf
    • http://files.mrspeabody.com/uploads/1/3/0/8/130815017/853c9765.pdf
    • http://govuduve.yoursaltsource.com/uploads/1/3/1/4/131483112/2265140.pdf
    • http://wafogo.custercadet.com/uploads/1/3/0/8/130874426/c556d2bc7d14e.pdf
    • https://uploads.strikinglycdn.com/files/b7f1cfae-548b-4ca8-bdb9-ea09c1948d49/84812017444.pdf
    • https://uploads.strikinglycdn.com/files/7110802f-2a97-47b1-8dfe-61fe3c438195/kokuxeneter.pdf
    • https://uploads.strikinglycdn.com/files/aa83a6d8-a934-42f7-beb8-7b5b37af04c8/12161823328.pdf
    • https://uploads.strikinglycdn.com/files/ae67afb5-e318-42c4-a5d7-e72fe678f571/41237781473.pdf
    • https://uploads.strikinglycdn.com/files/f0d53a29-c28e-431b-b8cb-20c3ebe35611/gavezorolexaxemegovizo.pdf
    • https://uploads.strikinglycdn.com/files/70bea435-1e1a-4375-a8c8-5f5fe67d75c7/buwasosawowefex.pdf
    • https://uploads.strikinglycdn.com/files/b7cdefae-233c-4fd2-9075-3f774d6f3229/vigugonapuzu.pdf
    • https://uploads.strikinglycdn.com/files/06ef5700-5ec7-47d2-b71d-554bc68cacaa/jisigonisefekal.pdf
    • https://uploads.strikinglycdn.com/files/4243296e-2c99-4bfc-b5d8-3a7d3b049e9f/23217982519.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e93.bin
75f9d6fcd84f11360fd1ede35fbfac2a16d2dbfb668a1a48e5b62b9b6f30e6d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E93 5680 bytes
font_01_sfnt_off000081ea.bin
19779e3f4e1fd8ff22d48956338e57106390018e1934fbd847882807c2849d70
pdf-font-stream PDF embedded font (sfnt) at offset 0x81EA 10796 bytes
font_02_sfnt_off0000a5c5.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xA5C5 16204 bytes