Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7bd194e3bb9183…

MALICIOUS

PDF

40.5 KB Created: 2020-08-15 07:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecaa24bd16486e219ad82ec62232e4c0 SHA-1: 700129b21d040a8deed35b658e7b7f0a32e8637b SHA-256: 4c7bd194e3bb9183bb08850d55476f541d3277b8ad028cf5e7daab3e9225460b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=android+9+sd+card+encryption', suggesting a lure to a malicious site. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to distribute malicious content. No scripts were extracted from this sample.

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.com/pify?keyword=android+9+sd+card+encryption
    • http://files.weslinchyoga.com/uploads/1/3/0/8/130814078/1945c76c6793b68.pdf
    • http://files.priscillecanivet.com/uploads/1/3/1/3/131383377/a32952bf2896.pdf
    • http://rewuso.blgarrettfilms.com/uploads/1/3/1/4/131483281/6dace945c022e.pdf
    • http://files.envisiongalleries.com/uploads/1/3/0/8/130815095/1986a7693b9a.pdf
    • http://files.yosoysantialva.com/uploads/1/3/1/6/131637953/reserere.pdf
    • https://cdn.shopify.com/s/files/1/0433/2873/3352/files/noferofegakilubuwomoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/rokomafezowuzivomojezal.pdf
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/geruwitinerujezejat.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/final_fantasy_7_rom.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5145/files/68686199020.pdf
    • https://cdn.shopify.com/s/files/1/0427/6404/2396/files/beramomimifaropoza.pdf
    • https://cdn.shopify.com/s/files/1/0432/1548/7137/files/enterprise_architect_patterns.pdf
    • https://cdn.shopify.com/s/files/1/0437/5193/2056/files/vba_excel_2020_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3355/files/romanul_enigma_otiliei.pdf
    • https://cdn.shopify.com/s/files/1/0431/6479/5044/files/70486068571.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_off00006276.bin
cda43753a1e51f66b876b6a6b3de51598f5114b0b285724a727da328409e46d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6276 5284 bytes
font_01_sfnt_off00007477.bin
21dcd196e56233754883fa9b2934210b0481d83500a284238bfb13d0f11530bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7477 9588 bytes