Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5e7d52cc6b0948…

MALICIOUS

PDF

56.0 KB Created: 2020-08-26 18:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08e4777e49f31a6da353f870674e3c00 SHA-1: 4644e580f293194c552c12a2884fceedfe9609fc SHA-256: 9f5e7d52cc6b0948771f8e5c403d44d632591dd606d9034f4c2e3c5088439985
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily corrupted, contains the malicious URL, suggesting a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=c%25C3%25ADrculos+perfeitos+em+minecraft
    • http://files.littlehandshomedaycare.net/uploads/1/3/1/4/131406068/voviwowu.pdf
    • http://files.azkillerbeessoftball.com/uploads/1/3/1/3/131382696/1538392.pdf
    • http://files.mbanwo.com/uploads/1/3/1/3/131383791/c06e9.pdf
    • http://files.sihanyang.com/uploads/1/3/1/6/131606003/tulirizako.pdf
    • https://cdn.shopify.com/s/files/1/0435/2347/3560/files/present_simple_vs_present_continuous_exercises_macmillan.pdf
    • https://cdn.shopify.com/s/files/1/0429/0812/3303/files/55608520772.pdf
    • https://cdn.shopify.com/s/files/1/0434/5357/9430/files/vidmate_video_converter_free_old_version.pdf
    • https://cdn.shopify.com/s/files/1/0439/4500/1115/files/sample_cv_for_graduate_school_admission.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/banefidofekadozimodomi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4773/9811/files/76277122042.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/geguji.pdf
    • https://cdn.shopify.com/s/files/1/0428/0900/0103/files/13094012219.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2551/files/53999987352.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/

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a7f.bin
a8bb295adce06666852798224f8c17cf63d4c16f7697ae4b42c723da0a07d689		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7F 3028 bytes
font_01_sfnt_off0000755b.bin
86acad2de2d357933054024622e7d3b3306a48b8d852c0ed49bb77dcc3718543		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755B 5120 bytes
font_02_sfnt_off000086a5.bin
cb6028086e6ec0c1691d6badcac641a545659820b1fd7736427ba9e0a00a9ce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A5 2264 bytes
font_03_sfnt_off000090f1.bin
face9393fab0a5dcba06831eea34021255dd03284004393429e4c7cae14f9436		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90F1 14360 bytes
font_04_sfnt_off0000bbdb.bin
3e66ce8c90719045bf8f6c8d5f716325bbce29c89c8399c9e71e7e90b46a9b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDB 16028 bytes

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