Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa81a27cca1886b…

MALICIOUS

PDF

40.1 KB Created: 2020-08-29 20:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3f665306d33c8c61f4f49a246f1eabc SHA-1: 6b590a24c98bc1d8c631a7356d1d467f8af7eb02 SHA-256: 0aa81a27cca1886b7368dcc46c79ae9eca28273a81e37ea1cb604b3bf6609156
162 Risk Score

Malware Insights

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

The PDF contains a lure for a free Fortnite license key, directing users to a malicious redirector URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm designed to attract traffic. The ML classifier strongly indicated maliciousness, and the embedded URL is a critical finding.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/wix?keyword=download+free+fortnite+license+key
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/77211410789.pdf
    • https://cdn.shopify.com/s/files/1/0434/0652/4583/files/programacion_de_base_de_datos_sql.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/irrigation_engineering_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68876684382.pdf
    • https://cdn.shopify.com/s/files/1/0436/0696/6430/files/70827383365.pdf
    • https://cdn.shopify.com/s/files/1/0432/3465/6423/files/casuistic_law.pdf
    • https://cdn.shopify.com/s/files/1/0428/1024/5286/files/23985417783.pdf
    • https://cdn.shopify.com/s/files/1/0462/2267/2025/files/95496249419.pdf
    • https://cdn.shopify.com/s/files/1/0434/3329/6028/files/reuleaux_rx200s_manual.pdf
    • https://cdn.shopify.com/s/files/1/0447/4303/2983/files/muis_ramadan_calendar_2020.pdf
    • https://cdn.shopify.com/s/files/1/0448/1299/2674/files/lala_ramswaroop_calendar_october_2020.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_off00005e99.bin
6ab61acc2c9c57e17509bb1723ddf5bc41df1e7c9fefa6df90bc39ebf354fdca
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E99 5272 bytes
font_01_sfnt_off000070b3.bin
1a154d1cc034f6a404d2bbd0c8d89b46f5ed395ea1bb4b99926b9338625fd3fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x70B3 10280 bytes