Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f1b316e56aa01c…

MALICIOUS

PDF

38.4 KB Created: 2020-08-31 18:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38ae13361163a2261c362849116e7858 SHA-1: 142836f127aba48a85d4bff642bb68b661c9af71 SHA-256: 77f1b316e56aa01c4c93cbca97c518516a5bbc2aa8ce04f48e4139d888c969a2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on static.usrfiles.com, creating a link farm. One of the primary links redirects to 'https://ttraff.ru/pify?keyword=sentence+structure+worksheets+for+grade+1', which is flagged as malicious redirector infrastructure. The document body itself is heavily obfuscated and appears to be a lure, likely intended to trick users into clicking these links. The presence of numerous links and the malicious redirector strongly suggest an attempt to drive traffic to potentially harmful sites.

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.ru/pify?keyword=sentence+structure+worksheets+for+grade+1
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/4d935e_7217ab3bf88a4900a211271155d0ecdf.pdf
    • https://static.usrfiles.com/ugd/4479ed_e61b7cdfbf804c4b88d9b217457c5dc4.pdf
    • https://static.usrfiles.com/ugd/79e0dc_dde1356225664e08913cc5802c016353.pdf
    • https://static.usrfiles.com/ugd/47b1e8_fdf0c40402c44fc7b0a26607b2e97984.pdf
    • https://static.usrfiles.com/ugd/b8c837_d848dcfe411946d194bb6a3471ffe9de.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e1b23471f6f4d3e8f2d2802ff2bfa3d.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ed78aad2bad426683c752065a27b131.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a157940a3f544febec2083513d0072b.pdf
    • https://static.usrfiles.com/ugd/10e3af_9e7addf1d9da49fc95225901a58ec0a1.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_82442122de4d4cb79386da0bd82fffc9.pdf
    • https://static.usrfiles.com/ugd/b8c837_302454ce0cdf42f5b196069a7f5d608f.pdf
    • https://static.usrfiles.com/ugd/eed56f_7c0fc1f9ea4e481c8c1c95650ec3c009.pdf
    • https://static.usrfiles.com/ugd/b8c837_607e5fb06bcc44f8b07ec7d86fae0efb.pdf
    • https://static.usrfiles.com/ugd/40b9e6_05139f5cdb8e489fad32f3e14e8aae0a.pdf
    • https://static.usrfiles.com/ugd/b8c837_4646e54ddc0649e38460ee08418bcde8.pdf
    • https://static.usrfiles.com/ugd/a2e20a_ada22bcc54dc4c0d9f08d409d5994194.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057db.bin
92e880c4da1f3c0d381deaa362758fcbae1aff749483f979710ad71dc608b51a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57DB 5560 bytes
font_01_sfnt_off00006ae0.bin
16fbf46d401cc068fbb182ecd7fb4357288708d9bcb16e71684f9f658dd6fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE0 9964 bytes

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