Malicious PDF — malware analysis report

Static analysis result for SHA-256 1617cd50a1b8b1a1…

MALICIOUS

PDF

38.6 KB Created: 2020-08-30 22:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba2d6452fd1030e10dcf3d1db42925d3 SHA-1: e59badd86217c3baaed7462558ef87aaa9dea8ea SHA-256: 1617cd50a1b8b1a1f4ab4cf6a3bf94d7818652e29c7934dd127f131d149f7d79
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a primary malicious redirector URL. The document body, though heavily obfuscated, contains text related to physics problems, likely a lure to encourage clicks. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a known malicious redirector.

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/wix?keyword=determine+the+magnitude+and+coordinate+direction+angles+of+the+resultant+force+of+the+two+forces
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4441/2309/files/ben_10_alien_force_all_aliens_transformations.pdf
    • https://cdn.shopify.com/s/files/1/0428/5726/7359/files/19715259428.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9270/files/xemozajorezobu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4456/1318/files/d_d_3._5_size_chart.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f45b8b58a4640e09e609d11f7edfd62.pdf
    • https://static.usrfiles.com/ugd/93971e_15e54024dc6e442e95665e3b0361d056.pdf
    • https://static.usrfiles.com/ugd/b8c837_d88f92868a5f40da95dd08a4dac8d4ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_580575a57c014bba9314d1ad3098713d.pdf
    • https://static.usrfiles.com/ugd/1decf9_7bae13cb2f404db9b64318800e6f4bdf.pdf
    • https://cdn.shopify.com/s/files/1/0436/9409/6539/files/cesur_yeni_dnya.pdf
    • https://cdn.shopify.com/s/files/1/0432/9517/8902/files/kamif.pdf
    • https://cdn.shopify.com/s/files/1/0431/4074/3329/files/77829852893.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_off00005665.bin
4a94fa5dfc8029543dcd93e446a01f6c397a18ca27df7f849d0907b867423be2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5665 5524 bytes
font_01_sfnt_off0000690a.bin
96c92865ee02b6951bab3d38c1467f09e4bbd6c50e146877b80ca7c81f782b76
pdf-font-stream PDF embedded font (sfnt) at offset 0x690A 10504 bytes