Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18fca76f6acaa7a…

MALICIOUS

PDF

35.1 KB Created: 2020-08-31 01:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8ee8360a95996054bd89d7249c44b05 SHA-1: c9060d41012bc65fe71f7483e5de0f10b0d3d220 SHA-256: e18fca76f6acaa7a1f768e382741671d22dcfad94ff08a3f092f35daa0267432
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=college+algebra+a+narrative+approach+3rd+edition+pdf'. This indicates the document's primary purpose is to redirect the user to a malicious site, likely for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious. While the document body contains garbled text, the presence of the malicious URL is the most significant indicator of malicious intent.

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/wix?keyword=college+algebra+a+narrative+approach+3rd+edition+pdf
    • https://cdn.shopify.com/s/files/1/0428/8790/5446/files/dress_code_semi_formal_mujer.pdf
    • https://cdn.shopify.com/s/files/1/0436/9996/2024/files/tipaxozat.pdf
    • https://cdn.shopify.com/s/files/1/0428/4514/3207/files/70024736296.pdf
    • https://cdn.shopify.com/s/files/1/0433/5517/7109/files/java_swing_full_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4965/files/30618981694.pdf
    • https://static.usrfiles.com/ugd/b8c837_20e39a787be1497a9b1ff2e3c267bea5.pdf
    • https://static.usrfiles.com/ugd/bb13a2_fb056111fcc547f89bf8dc1b27a19418.pdf
    • https://static.usrfiles.com/ugd/d5415a_c632efbebe4843499e53f08f724f5893.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_0507e12769e34c3995f3a5db6ea351eb.pdf
    • https://static.usrfiles.com/ugd/4117a9_9a7d3a68a1d143af9b337f117afcf85f.pdf
    • https://static.usrfiles.com/ugd/0049ca_6464a41eb76240c582950237b3e18dfb.pdf
    • https://static.usrfiles.com/ugd/764aaa_6ec23fdb406c4c60ad319bb08a473a09.pdf
    • https://static.usrfiles.com/ugd/4b874d_207cd8ae97e24e1fa98cfe4b7ecf1a00.pdf
    • https://static.usrfiles.com/ugd/b8c837_ebea13e3c4a541a6bf99565aba021981.pdf
    • https://static.usrfiles.com/ugd/fedf23_928b8c4bd62049838f7e1c9c6ab4d38b.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2292/files/xaruborekonilos.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/13626792536.pdf
    • https://cdn.shopify.com/s/files/1/0429/8519/3621/files/chemistry_silberberg_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0470/9797/0838/files/food_cart_franchise_philippines.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_off00004a51.bin
8de858906813eb8ee56fd148d09a98d0e75fe602e5f4d125b7bca0da4442d862		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A51 5508 bytes
font_01_sfnt_off00005d07.bin
57bfde3024dfc96d70a817c430f28fae87dcee8c740a82862294d6bd73f53d91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D07 9952 bytes

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