Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2058b3e06be60d…

MALICIOUS

PDF

61.3 KB Created: 2020-08-07 23:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0263468d1ba430bd6c6c770ed2a492c9 SHA-1: 695e2d2379d7aecfe8192ab9aafa99d7d6337ad1 SHA-256: 2a2058b3e06be60dd25f51ee3ccb8d7961d233258e2de379c43ec142f688cfd5
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=download+tutorial+excel+2020+pdf'. Another critical heuristic identified a PDF link farm, indicating a large number of external links, with the first being 'https://cdn.shopify.com/s/files/1/0433/8617/5651/files/ejercicios_adverbios_de_frecuencia_en_ingles_6o_primaria.pdf'. The document body, though heavily obfuscated, contains text related to downloading a tutorial, reinforcing the lure. The ML classifier also flagged this PDF with high confidence.

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=download+tutorial+excel+2020+pdf
    • http://texajim.hanworth-barn.co.uk/uploads/1/3/0/7/130776791/3810319.pdf
    • http://files.taotantricteachers.com/uploads/1/3/1/4/131409463/lilizul_xojilaminokowo_fisil.pdf
    • http://xifop.kickapoovolleyball.com/uploads/1/3/1/3/131381464/fawad.pdf
    • http://files.dalewoodbaptistpdo.org/uploads/1/3/1/4/131453674/7862620.pdf
    • http://files.joanberkey.com/uploads/1/3/1/4/131454255/635339.pdf
    • https://cdn.shop
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/ejercicios_adverbios_de_frecuencia_en_ingles_6o_primaria.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9277/files/butufelevedoxajolarikob.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6657/files/15798583707.pdf
    • https://cdn.shopify.com/s/files/1/0437/1628/0475/files/6251971912.pdf
    • https://cdn.shopify.com/s/files/1/0438/1723/8685/files/6279101639.pdf
    • https://cdn.shopify.com/s/files/1/0429/6327/1833/files/71598923360.pdf
    • https://cdn.shopify.com/s/files/1/0438/8395/4328/files/68879641437.pdf
    • https://cdn.shopify.com/s/files/1/0434/3503/2737/files/dosunulub.pdf
    • https://cdn.shopify.com/s/files/1/0437/9970/7805/files/definicion_de_malos_habitos_alimentarios.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11067845032.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a53.bin
83ef825c5a32ed24359f8c42d5070c5d5d219abd25ad8f260c61ad3558423012		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A53 5404 bytes
font_01_sfnt_off00009cdb.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CDB 1800 bytes
font_02_sfnt_off0000a569.bin
50eeac2af2aa85840776a24260aaae17e33514a04bd2c1287e2daaedf5ff6064		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA569 14104 bytes
font_03_sfnt_off0000d1e6.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E6 16312 bytes

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