Malicious PDF — malware analysis report

Static analysis result for SHA-256 52dfa81b548d838b…

MALICIOUS

PDF

42.9 KB Created: 2020-08-08 09:39:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fd27b7bd00df0ad012064d34857ce8e SHA-1: 49d59ed867d0c7e3148b281c41b2c4215420a67a SHA-256: 52dfa81b548d838b6c6e4284766d60caade151d3be0810d738dd346ea2d2c096
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.cc. The document body, though heavily obfuscated, contains the same URL and text related to a 'carpentry workshop pdf', suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains, likely for SEO manipulation or to host further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=carpentry+workshop+pdf
    • http://files.prestonbrookvillagehall.com/uploads/1/3/1/4/131452826/5190370.pdf
    • http://files.uhsguidance.com/uploads/1/3/0/7/130740368/womag.pdf
    • http://files.homeloverswallcovering.com/uploads/1/3/2/3/132303353/toreritu_vokoge_womupabuxogepu_nabige.pdf
    • http://files.imexsar.com/uploads/1/3/1/4/131438068/dewawe-vilurobujat-kivagunoxutolul.pdf
    • http://files.alpveg.com/uploads/1/3/1/4/131438127/xulujuzakunab-nenoxojefeb-wiralipo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4442/1282/files/20825155531.pdf
    • https://cdn.shopify.com/s/files/1/0436/1430/6466/files/b._a_english_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/4354/3447/files/aprendizaje_cooperativo_en_educacion_infantil.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9766/files/jofusagogadoxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5366/2887/files/36037319387.pdf
    • https://cdn.shopify.com/s/files/1/0437/0392/6952/files/99992100989.pdf
    • https://cdn.shopify.com/s/files/1/0432/3291/9720/files/mavaremesefudoxefasubix.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1800/files/15480213266.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/vukemoxolozugufuzibevub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96989945255.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinubigelezegir.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_off000067da.bin
52594c39f785a7468f8e4795f38683ee51ba20bc9d0ded0346b3755638a6e4cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x67DA 5260 bytes
font_01_sfnt_off000079d1.bin
39b186343cbd28e3b3447c08680499dc16e54c6bd604ac616e7e0dbe4ae4de7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x79D1 10844 bytes