Malicious PDF — malware analysis report

Static analysis result for SHA-256 83209106bbf02d1f…

MALICIOUS

PDF

40.1 KB Created: 2020-08-22 23:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b101043cac802c59d0a87a07955795e SHA-1: 3cf20013c7d094b762fad572a625ad3b9d215da3 SHA-256: 83209106bbf02d1f2cf051a52c5dc7de7474981b2de25a1e56e7a82a4cf0c132
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading Windows 10 ISOs. The presence of many external PDF links suggests a link farm or redirection scheme designed to obscure the ultimate destination.

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/pify?keyword=windows+10+iso+for+mac+free
    • http://files.laclassedejjonet.com/uploads/1/3/0/9/130969235/puwabuvonuvaf.pdf
    • http://files.aucklandsuzukiviolinschool.com/uploads/1/3/1/4/131408172/d9d5ae409.pdf
    • http://kifiko.orvjamboree.org/uploads/1/3/0/8/130874422/9f0e396f6059c1.pdf
    • http://zotujut.theeaglegallery.com/uploads/1/3/1/4/131437363/3b46da.pdf
    • http://zojekibus.ruleyscanecorsos.com/uploads/1/3/1/1/131164250/06c3027054c79.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0203/5351/files/optex_bx_80nr.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/angular_jspdf_autotable.pdf
    • https://cdn.shopify.com/s/files/1/0431/4500/3169/files/joxute.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7284/files/analytical_philosophy_books.pdf
    • https://cdn.shopify.com/s/files/1/0438/0216/5410/files/upload_a_to_google_drive.pdf
    • https://cdn.shopify.com/s/files/1/0437/8794/4096/files/kitotamelokola.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7284/files/flawed_dogs.pdf
    • https://cdn.shopify.com/s/files/1/0437/7296/9109/files/barrett_esophagus_pathology.pdf
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/nurorefuju.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1637/files/xegutegewegimasena.pdf
    • https://cdn.shopify.com/s/files/1/0434/3113/3351/files/adventures_of_aladdin_2019_english_subtitles.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_off00005e7a.bin
8e248ffd892b4eb8fc109af9eb05a729c7bf6d15af13b264290bfc70cf04bce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7A 5436 bytes
font_01_sfnt_off000070f4.bin
c403ba1cf3aec9386b0f46c6c843b99cafd7120d3168250f77385f66621062c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F4 10084 bytes

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