Malicious PDF — malware analysis report

Static analysis result for SHA-256 e977ecfa7a614f33…

MALICIOUS

PDF

47.5 KB Created: 2020-08-23 06:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb7a1bacb18821adb7e068a970103c8d SHA-1: 172e2f0f7eaa1417adca3ed5ed62d7fc6705d1e9 SHA-256: e977ecfa7a614f339916e64165384c61c18de385c58af6cfeef122837ca961ea
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a malicious redirector link. The document body, though heavily obfuscated, contains the URL that triggered this alert. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many of which are hosted on Shopify. The primary malicious URL is https://ttraff.ru/pify?keyword=alain+deneault+mediocrity+pdf, which is likely used to redirect users 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.ru/pify?keyword=alain+deneault+mediocrity+pdf
    • http://files.drkaylee.us/uploads/1/3/0/7/130739614/01eda3.pdf
    • http://nodiwuras.mjdemasi.com/uploads/1/3/1/3/131379732/444777.pdf
    • http://files.ethelbustamante.net/uploads/1/3/1/4/131406356/7012749.pdf
    • http://files.nicacov.org/uploads/1/3/1/8/131871648/rewojisuzoziwum_nogegila_nabavogisuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/2084/5210/files/zelifukozemokogin.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/60970052455.pdf
    • https://cdn.shopify.com/s/files/1/0446/3860/1379/files/business_communication_essentials_fourth_canadian_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/7539/4977/files/43583808790.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/46797209833.pdf
    • https://cdn.shopify.com/s/files/1/0438/4958/0704/files/13162152731.pdf
    • https://cdn.shopify.com/s/files/1/0434/7291/2549/files/tennessee_driver_s_handbook_2016.pdf
    • https://cdn.shopify.com/s/files/1/0437/3970/9589/files/natikadetakedoxafewivuse.pdf
    • https://cdn.shopify.com/s/files/1/0437/9371/1261/files/biogeochemical_cycles_of_nitrogen.pdf
    • https://cdn.shopify.com/s/files/1/0433/8198/1347/files/75012130043.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26965864763.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_off00006e7c.bin
f2be90385ee46441cb485f525b6c20cbdbe6d4af0ff9d239ab4a86bc7893f721		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7C 5096 bytes
font_01_sfnt_off00007fba.bin
88cc6d8f3baa804f60530745aeea14aeceaa61e970b109816d6c43a75c7780a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FBA 10400 bytes
font_02_sfnt_off0000a300.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA300 4324 bytes

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