Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5f93dd1518a081…

MALICIOUS

PDF

41.2 KB Created: 2020-07-09 05:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 941d155b383561bc1454f3e9c4e78ac9 SHA-1: b5a723aec63bf9d0d92cc5a6451b21063c15c591 SHA-256: 6b5f93dd1518a081fa8f6c84160a43f6f0f7577bfabc50c06a0f431a166ae968
162 Risk Score

Malware Insights

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

The PDF document contains numerous links, including one to a known malicious redirector, and is flagged by an ML classifier as malicious. The document body, though obfuscated, suggests a lure related to converting Word documents to PDF, likely to trick users into clicking the embedded links. The presence of a large number of SEO-optimized PDF links indicates a link farm designed to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=cara%20mengubah%20word%20ke%20pdf%20microsoft%202010
    • http://files.laurengoldsteinart.com/uploads/1/3/1/8/131856770/leniwelowenigiweloz.pdf
    • http://files.holyfamilypawtucket.org/uploads/1/3/1/6/131606335/fenoxigawew.pdf
    • http://files.masoncitychristian.com/uploads/1/3/1/4/131454024/5377651.pdf
    • http://files.drdavidzuniga.com/uploads/1/3/0/7/130775603/bepor.pdf
    • http://files.abiyoga.com/uploads/1/3/1/3/131383645/zabevomaji.pdf
    • http://files.danasnationresources.com/uploads/1/3/1/4/131438611/miven.pdf
    • http://files.walnutgrovebaptistchurch.net/uploads/1/3/2/6/132695569/5ad17d7bca903d6.pdf
    • http://files.njagc.org/uploads/1/3/0/8/130814591/susejaputijifedud.pdf
    • http://files.extremeglamhair.com/uploads/1/3/2/6/132695273/37792b92ec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nogutomat.files.wordpress.com/2020/07/migudidagamuxe.pdf
    • https://folaredatar.files.wordpress.com/2020/06/85667871208.pdf
    • https://jisabiwofif966812601.files.wordpress.com/2020/07/zorajifowolobuzokowe.pdf
    • https://dodizuzila.files.wordpress.com/2020/07/49069687249.pdf
    • https://sexegid.files.wordpress.com/2020/07/sosetasiralomere.pdf
    • https://pixapivuba.files.wordpress.com/2020/06/80015531194.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/befuxaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rabilividobakomitunaxizug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zupapinited.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31321710084.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_off000060ac.bin
757d7048cfb2511509850c2db0b47f8a44e39db601db7ea4af50ef760c9782db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60AC 6064 bytes
font_01_sfnt_off0000753a.bin
2fdbfcba1cb1c8e46fc91bdd40e26e608fe1445996371995e0549903a984ee49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753A 10340 bytes

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