Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7dc129ff97052b…

MALICIOUS

PDF

46.5 KB Created: 2020-09-09 06:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da5476dfd72b4a7a20b40342fa18c2d6 SHA-1: 442a9b73fd2d6837175bd3306f1372370f10f440 SHA-256: 9f7dc129ff97052b0dea09fa8ace78d942d3c5f568e66599dbd164a53e4b61a0
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.link/wix?keyword=assessment+in+art+education+pdf'. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, with the primary one pointing to a Shopify domain. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the lure.

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.link/wix?keyword=assessment+in+art+education+pdf
    • https://cdn.shopify.com/s/files/1/0435/1390/5311/files/50427548424.pdf
    • https://cdn.shopify.com/s/files/1/0457/0683/8172/files/bubijivudajeki.pdf
    • https://cdn.shopify.com/s/files/1/0432/3331/2925/files/kodak_image_station_4000mm.pdf
    • https://cdn.shopify.com/s/files/1/0430/9218/1153/files/dufeb.pdf
    • https://cdn.shopify.com/s/files/1/0458/6163/4201/files/22399095775.pdf
    • https://cdn.shopify.com/s/files/1/0432/1722/3847/files/algoritmos_de_ordenamiento_interno.pdf
    • https://cdn.shopify.com/s/files/1/0433/5196/5855/files/arbeitsvertrag_minijob.pdf
    • https://cdn.shopify.com/s/files/1/0440/0267/2798/files/morimasozutulitimi.pdf
    • https://cdn.shopify.com/s/files/1/0448/4051/7792/files/cub_cadet_repair_manual_for_snow_thrower.pdf
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/16290141221.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0245/files/android_auto_mirror_no_root_2019.pdf
    • https://static.usrfiles.com/ugd/2d797c_6ed38100111e47b9b40108b4df833ef4.pdf
    • https://static.usrfiles.com/ugd/0d2908_ab67a408abd2453cb9f44662fb1ddbef.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_off00007403.bin
b42e11c8457ac39a276c730cc1648daeb1b8674801766a599eaf40ad581328c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7403 5260 bytes
font_01_sfnt_off000085d0.bin
aabd05c1bf7e22911f673aebe976e3d84d4e4954aa5624c5b98bed1c0e081c0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x85D0 11120 bytes