Malicious PDF — malware analysis report

Static analysis result for SHA-256 640a137b27faafc6…

MALICIOUS

PDF

49.8 KB Created: 2020-07-30 15:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9edff220ba1dddd2adc3354a9b6e5dd SHA-1: 1ffc06dd4cefb390387021601cdec5016297138e SHA-256: 640a137b27faafc6166657560b0b0289fb83d18db911bb97aeaca10a4477d734
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ML classifiers as malicious and contains a link to known malicious redirector infrastructure. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files. The presence of a 'download button' heuristic suggests a lure to trick users into clicking the malicious link, likely to download a secondary payload or redirect to a phishing site.

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/pify?keyword=change+pdf+comment+text+color
    • http://files.barneyspumps.com/uploads/1/3/2/6/132695325/dabd4fd.pdf
    • http://files.chefpops.ca/uploads/1/3/1/4/131437295/rulirupemabevof-tunafukedafu.pdf
    • http://files.grettaharleymusic.com/uploads/1/3/2/8/132814071/rudisopadofakelu.pdf
    • http://files.setthestagecostumesprops.com/uploads/1/3/0/7/130775011/voxubozakudukugabub.pdf
    • http://files.shadysideofthetracks.com/uploads/1/3/1/4/131406762/9744250.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7540/3929/files/rulolipef.pdf
    • https://cdn.shopify.com/s/files/1/0436/5107/2158/files/61652334613.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78985131446.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/11056467910.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9644/files/21878953445.pdf
    • https://cdn.shopify.com/s/files/1/0431/7780/3925/files/fexabafepunaxibitovolajom.pdf
    • https://cdn.shopify.com/s/files/1/0437/3646/5559/files/87624692541.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/retagidewegowopivuwedel.pdf
    • https://cdn.shopify.com/s/files/1/0431/0604/2023/files/62425914237.pdf
    • https://cdn.shopify.com/s/files/1/0435/4686/9911/files/30578213360.pdf
    • https://cdn.shopify.com/s/files/1/0432/9527/7214/files/99530265259.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5823/files/zufumofopasanogijifuro.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_off000084a8.bin
b9bd3aa02636491c0e1b65fcb93af184e505cba107dc0afa3a176d6fba991b45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A8 5224 bytes
font_01_sfnt_off00009640.bin
50a4628e0210c296f50bf4d17bbdd07113c831b6d93d7ef7a4cbdff831009e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9640 10244 bytes

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