Malicious PDF — malware analysis report

Static analysis result for SHA-256 515306e720ca50b9…

MALICIOUS

PDF

43.9 KB Created: 2020-08-07 08:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 299cb7f04270deb730ebcf757fc8ac9f SHA-1: 25fe2ec998b8c9988f9186ecca3af20b85d32af5 SHA-256: 515306e720ca50b96b8941e887dc0d168257fb86c2ebf178e859b5200cca0a2b
154 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to malicious infrastructure, specifically the URL https://ttraff.cc/pify?keyword=article+writing+for+class+6+pdf. This technique is often used to obscure the final malicious destination and bypass security controls. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, many pointing to Shopify domains, suggests a coordinated effort to distribute malicious content under the guise of academic resources.

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/pify?keyword=article+writing+for+class+6+pdf
    • http://files.cascade-optical.com/uploads/1/3/1/4/131406337/4287894.pdf
    • http://files.dbsatennessee.org/uploads/1/3/1/4/131453124/5c6fb1a2.pdf
    • http://files.rollecanalsociety.org/uploads/1/3/0/9/130969206/654592c.pdf
    • https://cdn.shopify.com/s/files/1/0434/5842/9089/files/differential_equations_boyce_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/negepep.pdf
    • https://cdn.shopify.com/s/files/1/0428/4337/3735/files/jasakad.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5743/files/52294577318.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/budget_2020_20_date_pakistan.pdf
    • https://cdn.shopify.com/s/files/1/0431/8943/6580/files/sikukawagofemabekiwukezi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6435/1130/files/24829056031.pdf
    • https://cdn.shopify.com/s/files/1/0431/2665/3090/files/christmas_carols_easy_piano.pdf
    • https://cdn.shopify.com/s/files/1/0434/5911/7222/files/ielts_speaking_follow_up_questions_with_answers_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/4170/2567/files/13101766276.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_off00006c4f.bin
2b61feaa0c06eacda2e458e76f43eb17e9e5540009c412455c1d29f14c0526e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4F 5556 bytes
font_01_sfnt_off00007f58.bin
1868f53c8bdccd51cabe51120ef291c7be2a5812d773e0a3b7ba0e60c6ff2d49
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F58 10264 bytes