Malicious PDF — malware analysis report

Static analysis result for SHA-256 9688f746f84c9038…

MALICIOUS

PDF

50.2 KB Created: 2020-09-10 08:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 285a1bb68fa49162c122ebe71c7de603 SHA-1: 12aa1817cbacb37568060993984c1b2543b5c890 SHA-256: 9688f746f84c903889edb8ca1564faa18a573672120d12735d7457c25bbd963e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains that appear to be part of a link farm designed to host SEO-optimized content. One prominent link, 'https://ttraff.me/wix?keyword=cavernous+malformation+brain+cancer', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting the primary purpose is to redirect users to malicious infrastructure. No scripts were extracted, but the PDF structure and embedded links strongly indicate a social engineering attack.

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.me/wix?keyword=cavernous+malformation+brain+cancer
    • http://files.myriversidefrenchcottage.com/uploads/1/3/1/8/131872238/715464e79640f11.pdf
    • http://files.yogaterrium.com/uploads/1/3/1/3/131384286/giluzaj.pdf
    • http://files.tjpfitness.com/uploads/1/3/0/7/130738928/c27bc52bae6.pdf
    • http://lobavefot.bcollectiveboutique.com/uploads/1/3/1/4/131406062/wixat_guxelawof_defabuxo.pdf
    • http://tozitif.ourbaptistheritage.org/uploads/1/3/0/7/130776208/gotutatipes-fogopeluvivav.pdf
    • https://static.usrfiles.com/ugd/97368a_1d779d6d360243e2a371debdb5759c43.pdf
    • https://static.usrfiles.com/ugd/b8c837_45aaa70368c748eabbcd910d550aa9b3.pdf
    • https://static.usrfiles.com/ugd/0010c8_16cd1ca88a2a45c5928d1883ad3f115d.pdf
    • https://static.usrfiles.com/ugd/7598fa_a49cd8b2585f4e42b7a163e2373b5074.pdf
    • https://cdn.shopify.com/s/files/1/0454/2513/1676/files/advantages_and_disadvantages_of_vert.pdf
    • https://cdn.shopify.com/s/files/1/0432/0742/6216/files/tabivifimagubulu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7676/4327/files/zijafimubolug.pdf
    • https://cdn.shopify.com/s/files/1/0433/8722/4213/files/fs_18_mod_apk_aptoide.pdf
    • https://cdn.shopify.com/s/files/1/0463/3739/2796/files/lemum.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_off000078f2.bin
7c44bbd4ba1707fb66bff54ea9cc373bccaf5898d45efd2fb9609de43491028c
pdf-font-stream PDF embedded font (sfnt) at offset 0x78F2 5132 bytes
font_01_sfnt_off00008a57.bin
d00d35ef1ab9246994b3d6e16082805b3f8c8e8ecf55e26bbfad22b8311b9a42
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A57 16052 bytes