Malicious PDF — malware analysis report

Static analysis result for SHA-256 84bb6acae9c43996…

MALICIOUS

PDF

53.4 KB Created: 2020-07-28 20:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27f295affd8cba1365dfbf2fbd06a577 SHA-1: afebe807d3f95eb21f3522c0770557d241b9f117 SHA-256: 84bb6acae9c439967f47296ba08c523d6d86b007eaa3d28c037b3c98e2729ff3
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'brush lettering free practice sheets' to entice users to click on these links. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or malware distribution.

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=brush+lettering+free+practice+sheets
    • http://files.nikkifountainphoto.com/uploads/1/3/1/6/131606059/ac15ac633c44.pdf
    • http://files.brantfordminorsoftball.ca/uploads/1/3/1/4/131452959/fe1cf5.pdf
    • http://files.madesimplydev.com/uploads/1/3/0/7/130775145/443176ec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/38326730735.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7063/files/tevadosupiju.pdf
    • https://cdn.shopify.com/s/files/1/0438/5934/5573/files/vadutajolo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3674/files/22154919081.pdf
    • https://cdn.shopify.com/s/files/1/0434/8998/4674/files/firepami.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/jiwigitod.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/10109572041.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zupapinited.pdf
    • https://cdn.shopify.com/s/files/1/0430/3139/6503/files/31035070613.pdf
    • https://cdn.shopify.com/s/files/1/0428/5267/9836/files/mupabarapivuxikemikoto.pdf
    • https://cdn.shopify.com/s/files/1/0431/4605/1744/files/54527260837.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/tunudiperexibupalajelule.pdf
    • https://cdn.shopify.com/s/files/1/0431/7980/2782/files/xefitisanujat.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ca9.bin
348fb357c411f2de930295d80b97f6f48e726253622bbd83187667214c7731f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA9 5096 bytes
font_01_sfnt_off00008dfa.bin
0fbca93755a688b537942ca42a6aad4dadbca5760a0f68851b9e2cdf86c488f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFA 10520 bytes
font_02_sfnt_off0000b1a6.bin
b7c4d71780b68f8c2c3b58fa8cc856106e4c7a8c1d1a9f62447c1c1e59527dfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A6 16328 bytes

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