Malicious PDF — malware analysis report

Static analysis result for SHA-256 deee1cce9d325c70…

MALICIOUS

PDF

42.9 KB Created: 2020-08-24 02:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22796ae08c96bd8e481ff89d70ae77b2 SHA-1: 9f03f72f332824337081a8382f399d5dacb2208a SHA-256: deee1cce9d325c700fd08016abf9d1725d5c33a644d6626017cb11911d36a662
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL (ttraff.cc) which is flagged as malicious. The document body, though heavily obfuscated, contains a reference to the same redirector URL and a benign-looking file name. The PDF also contains a large number of embedded links, many pointing to Shopify, which is indicative of a link farm used for SEO manipulation or to obscure the final malicious destination. The ML classifier strongly suggests maliciousness.

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=beach+wallpaper+free
    • http://files.dadonkeyonline.com/uploads/1/3/1/0/131069899/tiputobaji_sipisitudoguk_fewubatik_defokuziw.pdf
    • http://files.sarahgorlow.com/uploads/1/3/0/7/130776151/345630aa4c34a.pdf
    • http://files.professionalbusinessplans.com.au/uploads/1/3/0/7/130739353/0b1c231628a158d.pdf
    • http://bulawi.bettelovestudio.com/uploads/1/3/1/3/131383483/fofuvarefanusupif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.pdf
    • https://cdn.shopify.com/s/files/1/0440/1774/6070/files/food_cost_percentage_formula_excel.pdf
    • https://cdn.shopify.com/s/files/1/0432/4917/2643/files/71643063732.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/zijefexexakejumupuvezu.pdf
    • https://cdn.shopify.com/s/files/1/0439/0082/9848/files/tcp_ip_sockets_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0433/3984/1695/files/depreciacion_y_amortizacion_ejemplos.pdf
    • https://cdn.shopify.com/s/files/1/0430/9221/3911/files/informatie_despre_columna_lui_traian.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/gapusovovunonunaka.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zosogorimojafi.pdf
    • https://cdn.shopify.com/s/files/1/0460/3576/3364/files/43273421739.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_off00005f67.bin
fd2174058a4e902093bf322672032aac0f705bc9a92eff8c60c6e769429ebcc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F67 4512 bytes
font_01_sfnt_off00006ed6.bin
6ecc472cc2002307356cf5bd363fafbdeec2e8a6dd6df02e895b902ff37f1211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED6 10012 bytes
font_02_sfnt_off00009125.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9125 4324 bytes

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