Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3dcb1af69a456e…

MALICIOUS

PDF

44.7 KB Created: 2020-08-18 21:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6e0deab977f2425bf275d8f857a1e4f SHA-1: 4a59264b701ec499810ede2780fa55a4bab33372 SHA-256: 4f3dcb1af69a456e65567de4c90bf7b73962e60ba3d88aa5922f2961d2b15c9c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) that is known to host malicious content. The document body, though heavily obfuscated, contains references to 'jobs powerpoint template' and the malicious URL, suggesting a lure to trick users into downloading further malicious content. The ML classifier also strongly indicated maliciousness.

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://ttraff.ru/pify?keyword=jobs+powerpoint+template
    • http://files.eveningsunmusic.com/uploads/1/3/1/4/131483391/kimipotunu_webofadujok_faxexa_vapexanerew.pdf
    • http://voxex.emilykwon.com/uploads/1/3/0/9/130969045/3f36c64af475d.pdf
    • http://lixilo.pobrose.com/uploads/1/3/2/8/132814930/604800.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5499/files/gelibo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/33374560870.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7658/files/31133931664.pdf
    • https://cdn.shopify.com/s/files/1/0444/4412/3302/files/wonky_donkey_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5298/2684/files/44070356898.pdf
    • https://cdn.shopify.com/s/files/1/0434/8972/2534/files/caffeine_mac_chip.pdf
    • https://cdn.shopify.com/s/files/1/0434/8493/8390/files/27742533624.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_off000072a7.bin
20ccad31644d81b8a49c96d53f452848b97d16095c811c501a45a526ea41a762		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A7 5188 bytes
font_01_sfnt_off0000843b.bin
21e042b300265d349f28995ec78e6af569eac532ac55dab34236aae810fcadc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x843B 10044 bytes

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