Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe896be026709e0…

MALICIOUS

PDF

40.5 KB Created: 2020-08-06 15:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9367ead52b4e3aa0b65d34affa4c0b2 SHA-1: 236490a4f096cfc402a62e9b8e987bea2c3384f1 SHA-256: 4fe896be026709e05c4775ffca13b7c2494c4f6b9bd9c5756f244b833db53813
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=physical+science+grade+11+platinum+textbook+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a textbook and the malicious URL, suggesting a lure to trick users into downloading further malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/pify?keyword=physical+science+grade+11+platinum+textbook+pdf
    • http://files.concealedwindowtinting.com/uploads/1/3/1/3/131380728/7422522.pdf
    • http://files.kaylaschmidt.com/uploads/1/3/0/7/130738639/kidarugawe_fokumefakug_pojaliwil.pdf
    • http://files.whippoorwillwoods-raynham.com/uploads/1/3/0/7/130776499/b9d43.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5372/files/jagarufixadi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3089/6026/files/nonesozovi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8331/6891/files/88373162169.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3795/files/34680983780.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/93082842137.pdf
    • https://cdn.shopify.com/s/files/1/0431/6495/8879/files/2016_us_holidays_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0434/3398/4161/files/durunonur.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/gutojixewarow.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/onyxia_quest_chain.pdf
    • https://cdn.shopify.com/s/files/1/0433/6880/8613/files/69989427188.pdf
    • https://cdn.shopify.com/s/files/1/0440/2587/2549/files/craftsman_675_series_lawn_mower_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/discord_markdown_change_color.pdf
    • https://cdn.shopify.com/s/files/1/0436/4589/4816/files/jaime_lorente_a_proposito_de_tu_boca_gratis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000509a.bin
95dec6abf50ff26b7984d0c0129819d4c7b39f08dd27769d86ab418ebd006967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x509A 5876 bytes
font_01_sfnt_off00006462.bin
060bf4ac1b6aad37164a3936bed66985cc351586b4fdfe6c23b386839280d7d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6462 9960 bytes
font_02_sfnt_off0000867b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x867B 4324 bytes

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