Malicious PDF — malware analysis report

Static analysis result for SHA-256 da36bd0df9626c31…

MALICIOUS

PDF

131.2 KB Created: 2020-08-15 06:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00074760d09df98e6fb9049a54de03fd SHA-1: f4961671ca35071ed07af53d72b55627d7a5a4b1 SHA-256: da36bd0df9626c319d391274bdc5ad5a9d16f5b211dec18b25d00c709dea50b9
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link. The embedded URL points to a redirector service that, when followed, leads to a link farm of SEO-optimized PDF downloads. The document body also contains the same malicious URL, suggesting the intent is to lure the user into clicking the link for a supposed free PDF download, which likely leads to a malicious 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.cc/wb?keyword=fundamentals%20of%20reservoir%20engineering%20pdf%20free%20download
    • http://files.dougcarpenterenterprises.com/uploads/1/3/1/8/131856519/xuketijetemojodovo.pdf
    • http://files.westyorkshirefurniture.co.uk/uploads/1/3/1/3/131398509/ligagipewopag.pdf
    • http://files.dpaulart.com/uploads/1/3/2/6/132683264/f67c8bf.pdf
    • http://files.bahamasteachercadets.com/uploads/1/3/0/7/130739916/a8026e1e.pdf
    • http://files.teslwindsor.com/uploads/1/3/1/4/131453823/8568157.pdf
    • https://cdn.shopify.com/s/files/1/0445/4006/8004/files/important_name_reactions_in_organic_chemistry_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3021/files/92027823485.pdf
    • https://cdn.shopify.com/s/files/1/0434/5335/0055/files/dmv_lehigh_acres.pdf
    • https://cdn.shopify.com/s/files/1/0434/3549/1490/files/mamekexobamavexegu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0763/7661/files/neoclassicismo_e_preromanticismo_letteratura.pdf
    • https://cdn.shopify.com/s/files/1/0435/1148/0472/files/5889055205.pdf
    • https://cdn.shopify.com/s/files/1/0431/2589/9421/files/xojamulilokekur.pdf
    • https://cdn.shopify.com/s/files/1/0429/1067/9203/files/understanding_and_using_english_grammar_3th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/4590/3774/files/javascript_concatenate_arrays.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sebifoxof.pdf
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/mimodej.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/aptitude_app_for_android_free.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017c64.bin
fd7f9df354944a73a21e9a0411e977e5d03c759fbef61bbfa049c408011c9f49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17C64 5468 bytes
font_01_sfnt_off00018f03.bin
539454d3107e1d3224303c77d998a880ad3368f9f7b70b65a0d52fce9445bd72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18F03 9664 bytes
font_02_sfnt_off0001a2ba.bin
b1e5f9800cb2cfa1a7c1d87c06a40feff4465fbfc3111fb7934c2685f6bcf6f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2BA 1188 bytes
font_03_sfnt_off0001a990.bin
7a5b707ba46a1c225f334193d8d14edab04b832d295b1706fe37940d2fb7f27a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A990 21056 bytes
font_04_sfnt_off0001e84b.bin
8c5634e7ac5800f7d0879a3ce2f3b61849bce6d8f0daf55cfa80993642abbe45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E84B 16220 bytes

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