Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fc85d3d5bda3d5…

MALICIOUS

PDF

34.3 KB Created: 2020-08-20 09:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ef1382bbbb293cac665539b7778afe2 SHA-1: 73ef4153df50cfe80aebd8186a85f3759cf04bab SHA-256: 05fc85d3d5bda3d5da6eca0167dc1eb6b0c67e3ab8546fcfd55b2c895b8030e8
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, includes text and URLs that suggest a lure for users to click and download content. The presence of a download button heuristic further supports this attack pattern. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=akhiyan+nu+goli+maar+diya+ringtone
    • http://gojufiseg.insta-answer.com/uploads/1/3/1/0/131070161/4165232.pdf
    • http://files.mcguinnesspainting.com/uploads/1/3/0/9/130969012/rufatekak.pdf
    • http://files.cupe9112.com/uploads/1/3/2/7/132740949/xinepofejifizup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5387/4329/files/63324445045.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4024/files/db_skull_pill_report.pdf
    • https://cdn.shopify.com/s/files/1/0447/6734/6839/files/21_cfr_medical_devices.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/how_to_annotates_on_notability.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/24296665103.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/tuxatisakezazoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/volefapigupis.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/vilukigawiwuboloworide.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9730/files/628458957.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gigogew.pdf
    • https://cdn.shopify.com/s/files/1/0434/3457/3991/files/xufewesikukunirapeva.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_off00004946.bin
e5de1cda0c095a3238e58e3d445deaabb6212860e2a7fd1e3c52ebed80c95be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4946 5216 bytes
font_01_sfnt_off00005ad5.bin
37f56e96a71ce5fc37d3fe8fd6e176a785911218eec0f71d6baca74a2e9a0a7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD5 9744 bytes

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