Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcf93a7c5179a4c…

MALICIOUS

PDF

43.6 KB Created: 2020-08-16 11:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f22f14c5184e82faa608e573c9f5dcf9 SHA-1: 60d33a1f62bc580ee43110d57650316eebd0fc61 SHA-256: 7fcf93a7c5179a4c9e9809b159773c5823acce7b6b92999f2eb9a699d160a274
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Windows 10 pro digital license free' and the malicious URL, suggesting a lure to download or access potentially harmful content. The presence of a large number of external PDF links further indicates a link farm designed to distribute malicious content.

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.ru/pify?keyword=windows+10+pro+digital+license+free
    • http://files.junyoungyang.com/uploads/1/3/1/8/131857304/e2039aa.pdf
    • http://zubijumo.mathiashse.com/uploads/1/3/2/6/132681422/tapajikosu-vumaxalupi-xelamivimi.pdf
    • http://files.alantibbetts.com/uploads/1/3/0/7/130775634/3445002.pdf
    • http://files.irwinparktreehouse.com/uploads/1/3/1/4/131437246/6c805bde600c5c.pdf
    • http://files.kirsteenmackayconsulting.com/uploads/1/3/2/7/132740293/fe1e27d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9041/8591/files/san_andreas_mods_installer.pdf
    • https://cdn.shopify.com/s/files/1/0433/3250/1656/files/nuwageluk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0710/6462/files/39111479720.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7585/files/morofakafafebulonukuxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7719/files/analyse_physico_chimique_du_yaourt.pdf
    • https://cdn.shopify.com/s/files/1/0433/8217/7946/files/rerepaxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/1205/5463/files/51678868500.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0919/files/devipuwudojil.pdf
    • https://cdn.shopify.com/s/files/1/0430/9745/6801/files/30600224737.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/newesadusubetov.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8246/files/15411431996.pdf
    • https://cdn.shopify.com/s/files/1/0447/4866/9079/files/58926306497.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_off00006a80.bin
0a4f2a360670e79e2064454b6f35a22eeb4363dc2266d548e615a8784ddb2686		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A80 5624 bytes
font_01_sfnt_off00007dc4.bin
479cd2b5754232a9baf5afacbb850a199a884dba88650a80ed6de0ff1c3ffdbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC4 10580 bytes

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