Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b95b8a4197a7786…

MALICIOUS

PDF

64.6 KB Created: 2020-08-15 15:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bc90b295fa3df56d9af6f7be1fa53a0 SHA-1: 6fa6d3265621e38f79d873239bb08f969401dab1 SHA-256: 0b95b8a4197a7786652624fe39a90c92692509bce34e3f846b1393f31c228ebe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm.

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/wb?keyword=imagemagick%20command%20line%20pdf%20to%20jpg
    • http://files.dns-for-me.org/uploads/1/3/1/8/131857758/vexix_visaxuge_zopawe.pdf
    • http://files.laurenstripling.net/uploads/1/3/0/8/130874615/ziziru-kuwesap-degazatirufo.pdf
    • http://files.rosecityroamers.org/uploads/1/3/1/3/131398046/110d69408fe04.pdf
    • http://files.theksbphoto.com/uploads/1/3/0/8/130873820/2357027.pdf
    • http://weset.wallbrosdrywallservices.com/uploads/1/3/1/8/131855981/sutemegasos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9737/5399/files/27553702558.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/38682377899.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/papozezomojup.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8795/files/learn_to_draw_in_30_days.pdf
    • https://cdn.shopify.com/s/files/1/0434/3654/0069/files/57835362210.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/87599178134.pdf
    • https://cdn.shopify.com/s/files/1/0429/8375/1831/files/alto_adige_quotidiano_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6026/4096/files/capacitor_physics.pdf
    • https://cdn.shopify.com/s/files/1/0431/5709/4559/files/terutoropugolofabukepos.pdf
    • https://cdn.shopify.com/s/files/1/0440/6099/9845/files/hyponatremia_guidelines_2017.pdf
    • https://cdn.shopify.com/s/files/1/0435/3127/2351/files/46568080368.pdf
    • https://cdn.shopify.com/s/files/1/0439/8232/3870/files/80104174638.pdf
    • https://cdn.shopify.com/s/files/1/0440/0329/5382/files/wedotedugo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8095/7598/files/autocad_import_text_issues.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_off0000b86c.bin
79e28944357e0cf79983a504581dd91e738d9bc73cfc30fa5adb4eaf298c421e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB86C 5280 bytes
font_01_sfnt_off0000ca58.bin
1678a1a1f63d32bf90b55ea151f45ff7e9f137c6f25b8c50ceef7495a1d09b33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA58 13236 bytes

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