Malicious PDF — malware analysis report

Static analysis result for SHA-256 924d001475f29cb4…

MALICIOUS

PDF

50.6 KB Created: 2020-08-07 13:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39cdf7487507ab1741ff034c13b63c35 SHA-1: a997e206c87ac6cc8a8930ab9a29140f29d2495e SHA-256: 924d001475f29cb4401889208088cc8e7586dc1a9219e5fe9743fd5f0f41813e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body itself contains the primary malicious URL, which is also listed as a link farm. The ML classifier strongly indicated maliciousness. The primary attack vector appears to be a lure to click on the embedded link, leading to a malicious site.

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.com/pify?keyword=ejercicios+aumentativos+y+diminutivos+3+primaria+pdf
    • http://kerav.schweitzercustoms.com/uploads/1/3/1/4/131452922/tikowezifatutag-fizifaf-xadogevadivug.pdf
    • http://files.mountainlakewinery.com/uploads/1/3/0/7/130740174/xosog_wakapit.pdf
    • http://kisetedax.brightwoodworks.com/uploads/1/3/1/6/131607163/zaruxivodonefubeb.pdf
    • http://vosipawu.baarleproeft.com/uploads/1/3/2/3/132302921/roxena.pdf
    • https://cdn.shopify.com/s/files/1/0434/8031/8118/files/faxaletukakasopoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/8945/3473/files/zetapisifolowus.pdf
    • https://cdn.shopify.com/s/files/1/0433/5278/5055/files/zupaw.pdf
    • https://cdn.shopify.com/s/files/1/0438/3545/7696/files/adobe_flash_crack.pdf
    • https://cdn.shopify.com/s/files/1/0434/2808/5912/files/miruxalurativarube.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2856/files/88952478471.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2524/files/26766949118.pdf
    • https://cdn.shopify.com/s/files/1/0437/1942/6198/files/lezavisem.pdf
    • https://cdn.shopify.com/s/files/1/0437/4098/7543/files/the_lineman_s_and_cableman_s_handbook_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1355/3827/files/duracell_battery_charger_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8535/files/71771527822.pdf
    • https://cdn.shopify.com/s/files/1/0433/6438/4927/files/60697314326.pdf
    • https://cdn.shopify.com/s/files/1/0434/7278/1478/files/3374298607.pdf
    • https://cdn.shopify.com/s/files/1/0429/3292/8671/files/81910609565.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_off00006db0.bin
e83b85bf2f3057561c56df0f1b3214e8ee9fbe1df61a33b8cfeb58c1ee13eb1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB0 5628 bytes
font_01_sfnt_off000080e0.bin
a32d6284dbcc36abc6b3c1808418b4b673aa614180b1eefd67c6414ad9ffd493		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80E0 11204 bytes
font_02_sfnt_off0000a593.bin
25b4721464b7316f01e21ed2c3faf4040515a2c9bdaa67695c41ecc6d6989cce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA593 16124 bytes

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