Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ecd4d6668d86224…

MALICIOUS

PDF

43.7 KB Created: 2020-09-17 06:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf2ec56aa3f9e7141e6d7cd98a338a41 SHA-1: b062e6138e16e55e996e0214b89ed0382c380977 SHA-256: 5ecd4d6668d86224bf8365b76cff9bd1fbbfab8e4d03eabf1e474f7387f2db88
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating that it directs users to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'Wahl cordless clippers manual'. This URL, along with other embedded URLs, suggests an attempt to redirect users to potentially harmful content. The ML classifier also flagged this PDF with high confidence.

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.club/wix?keyword=wahl+cordless+clippers+manual
    • http://files.thecarluccishow.com/uploads/1/3/1/4/131407214/8744904.pdf
    • http://mabawusiz.sydmocreativeco.com/uploads/1/3/1/6/131606457/nonuminusasoxo_wepoxasagavu_wimolu.pdf
    • http://nisomo.tpched.org/uploads/1/3/0/7/130775493/wuvuzosedadugamiw.pdf
    • http://files.rayconant.com/uploads/1/3/2/6/132682204/034ee7.pdf
    • http://files.caitlincannonphotography.com/uploads/1/3/1/4/131409009/5339114.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://a5a28865-3faf-48ed-92b4-f2daecd5d04c.filesusr.com/ugd/c4f63d_7c10860e30e748bb81c1293e9e20656a.pdf?index=true
    • https://6d51f974-8437-48aa-bea7-56ea14d7aded.filesusr.com/ugd/7a359d_10ae31e969d44236b1c78946cc73315a.pdf?index=true
    • https://e87e076c-8ce8-4833-b5d8-fa7b701388f9.filesusr.com/ugd/bc4951_14f851e6fe06452e9708def0dbef0690.pdf?index=true
    • https://f7d9d921-20a2-4546-b83c-b56d147a4992.filesusr.com/ugd/5befcb_6c7a947800c243689764c24feae14273.pdf?index=true
    • https://f9210f2f-f3aa-473d-b991-3a1531095aec.filesusr.com/ugd/f2ef67_5800311ebf2f4f5ead78fa71730981d9.pdf?index=true
    • https://c30f2c42-31f5-41e1-a1a0-1c6bb4a1aadc.filesusr.com/ugd/a76634_02404d6ef652435cbbdc31b914da9972.pdf?index=true
    • https://9c778ef6-4308-455e-9d9b-5e0f6aa6ab6e.filesusr.com/ugd/0aab01_385de6026a61485fa901356b7d28bd78.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/0288/7322/files/wubepur.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/wuwowomunelopibimigam.pdf
    • https://cdn.shopify.com/s/files/1/0436/9914/2810/files/41440111566.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cfc.bin
83de4622d2bfc49299d9e4a8f3de9f2f0b66fb404403600d3719bf84ef89a575		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFC 5128 bytes
font_01_sfnt_off00006e3a.bin
813bad063632b36c5e1538b818df38cdde80a05a68b9434c7f960763a02196bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3A 10576 bytes
font_02_sfnt_off00009262.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9262 4324 bytes

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