Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b939c8d4e1f5a52…

MALICIOUS

PDF

52.9 KB Created: 2020-08-15 20:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac8d0cbd1dff28b2be1fa4394de5f908 SHA-1: 1469143e853798803b87dada44ae2ea8719b611d SHA-256: 8b939c8d4e1f5a52538bda5b40404d9843bd6dd6bc21c35be899d43cecf5b92c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains URL fragments that appear to be part of a lure related to a 'power bank xiaomi 20000 2c manual'. The presence of a PDF link farm heuristic further suggests an attempt to distribute malicious content or SEO spam. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wb?keyword=power%20bank%20xiaomi%2020000%202c%20manual
    • http://files.igi-fitness.com/uploads/1/3/2/6/132695782/8730873bd.pdf
    • http://files.cordovaswitnesses.com/uploads/1/3/0/8/130874110/5027452.pdf
    • http://files.tshollband.com/uploads/1/3/2/8/132814343/wukutomik_notaruzu_gutofumoxe_pojazisok.pdf
    • http://files.gratitudecafebakery.com/uploads/1/3/1/1/131164199/a09e2473.pdf
    • https://cdn.shopify.com/s/files/1/0437/6618/6135/files/ginageroguk.pdf
    • https://cdn.shopify.com/s/files/1/0435/3202/6008/files/frederick_noad_solo_guitar_playing_book_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/19853714557.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/xidevejus.pdf
    • https://cdn.shopify.com/s/files/1/0437/4013/5589/files/describing_people_s_personalities_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/33374625424.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tesip.pdf
    • https://cdn.shopify.com/s/files/1/0434/3119/8886/files/45822907076.pdf
    • https://cdn.shopify.com/s/files/1/0430/4191/5042/files/backgammon_regeln.pdf
    • https://cdn.shopify.com/s/files/1/0428/9875/1641/files/fimigunuviris.pdf
    • https://cdn.shopify.com/s/files/1/0437/1687/0296/files/test_riesgos_laborales.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0209/files/kansas_bill_of_sale_car.pdf
    • https://cdn.shopify.com/s/files/1/0437/5176/8225/files/revasurevumivofiwo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0668/1497/files/atomic_structure_timeline.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_off00006d0f.bin
b81fd82a6c0eecacfec83fc83cb3f3b529f2d4dd712fa8dc92f2b610cc4db25e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0F 2316 bytes
font_01_sfnt_off0000773c.bin
4d869b8f5eb9607e539e77dec159ba6168820c2019a1cff41aeda6274fbddaa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773C 5208 bytes
font_02_sfnt_off000088da.bin
351fe6c10cd6078bfc4d57aa4ee773bed517b6c680c55aceeadcbe8a752ffd14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88DA 2076 bytes
font_03_sfnt_off000091dc.bin
9bfa4f2202d7621788325c08bd91f5bdfe3fa9213f52299151674be62d3ec58c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91DC 10496 bytes
font_04_sfnt_off0000b53d.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB53D 4324 bytes

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