Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8245eb3ec887d9…

MALICIOUS

PDF

42.8 KB Created: 2020-08-17 03:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d0e8197d90cbf412b6cef7267975246 SHA-1: 6652c1f40322028bbf684cd89c1d5ea5f7e7a2c3 SHA-256: 2a8245eb3ec887d9bae2753d51e02fb7d6f3b0bb5dda0bd210cd89de3131ca0d
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high ML score and the presence of a malicious redirector link. It also contains a link farm, with the primary malicious URL pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains references to the same URL and other benign-looking Shopify links, suggesting a lure to disguise the malicious intent. The primary malicious URL is likely used to redirect users to a phishing page or a malware download site.

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=transformers+studio+series+bumblebee+movie+optimus+prime
    • http://mizirib.grinnellcecbucketcourses.org/uploads/1/3/1/1/131163590/1500684.pdf
    • http://files.travelwithloridanette.com/uploads/1/3/1/4/131438718/14d415dd2d3e0.pdf
    • http://files.wilkespe.com/uploads/1/3/1/0/131070379/2243810.pdf
    • https://cdn.shopify.com/s/files/1/0435/6944/7073/files/40235370301.pdf
    • https://cdn.shopify.com/s/files/1/0428/1014/6983/files/biology_lab_report_example.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lipowu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67331216746.pdf
    • https://cdn.shopify.com/s/files/1/0432/8777/3342/files/beethoven_music_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/2232/6696/files/73987332505.pdf
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/42663435777.pdf
    • https://cdn.shopify.com/s/files/1/0435/9651/3448/files/biological_classification_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0440/4844/9701/files/92091412071.pdf
    • https://cdn.shopify.com/s/files/1/0432/1751/8751/files/bubexizexil.pdf
    • https://cdn.shopify.com/s/files/1/0438/6465/3984/files/241648956.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_off000068a5.bin
0c1a3fc686f310403480854c6ab1be4f22d546e9ba20d44e6a69c5ba69d3957f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A5 5336 bytes
font_01_sfnt_off00007aaa.bin
288ea4ac11251d4dd8e3386ff9e072af343285e99ca9d3d526e8b09e719b3522		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAA 10396 bytes

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