Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24023307ec69b9c…

MALICIOUS

PDF

36.7 KB Created: 2020-08-04 22:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac7b6d47d5fac4d04cf7502d30945cb2 SHA-1: 6157455a9b589c288927ae8783498cb427418665 SHA-256: a24023307ec69b9c73898f3900cbf94f4cf67b4f71c2a2eeebd2dc1a74cab198
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, characteristic of a link farm. One of these links, https://ttraff.ru/pify?keyword=angulos+de+elevacion+y+depresion+en+situaciones+reales+pdf, is flagged as a known malicious redirector. The document body itself is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, suggesting it's not intended for human consumption but rather as a vehicle for distributing malicious links.

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=angulos+de+elevacion+y+depresion+en+situaciones+reales+pdf
    • http://files.divorcecoachingandconsulting.com/uploads/1/3/0/8/130874518/bejam-soselovorifat-tekumubobup-powidonuvewadar.pdf
    • http://files.tidygardensfencing.com/uploads/1/3/0/7/130774990/1813824.pdf
    • http://files.highsandhellos.com/uploads/1/3/2/7/132740293/voxesolexetug.pdf
    • https://cdn.shopify.com/s/files/1/0433/7713/1683/files/naruto_shippuden_episode_327_english_dubbed.pdf
    • https://cdn.shopify.com/s/files/1/0432/7230/6852/files/47096965634.pdf
    • https://cdn.shopify.com/s/files/1/0433/3584/3994/files/subupotelesigoxu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/wicked_game_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0430/6219/8425/files/tuzajatisifuloresadipijix.pdf
    • https://cdn.shopify.com/s/files/1/0433/3866/2053/files/tusogewopoxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/tidosenuzazijunajikuzu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1961/5901/files/dvd_shrink_cnet.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1069/files/87580209799.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/nagogutuworelorosabu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5827/3185/files/67193908948.pdf
    • https://cdn.shopify.com/s/files/1/0430/1085/0979/files/effects_of_air_pollution_file.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_off00004f78.bin
c09652642748ca9aa4cbfb805f310f692a97d08e183cb162c06609b12b97c7aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F78 5472 bytes
font_01_sfnt_off0000623c.bin
783dc17cac832e97d25e25079604fd22d80bca97817cb4421c9eb39cc1e3e2a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x623C 10956 bytes

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