Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40b4d8ce54bcfa7…

MALICIOUS

PDF

43.0 KB Created: 2020-09-16 15:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db13c672952fba48dd6bdae6c4c74191 SHA-1: 1741c08f2d9fd0d7a87087c73dc7e48e245dfe46 SHA-256: a40b4d8ce54bcfa7337678520eed4c9519eed57381971f313f457e7d1fb837dd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, forming a link farm. One of these links, https://ttraff.me/wix?keyword=curtis+and+son+funeral+home+north+chapel, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains text related to funeral homes and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent of the link farm.

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.me/wix?keyword=curtis+and+son+funeral+home+north+chapel
    • https://a357ee29-4fce-47ac-af3a-99d5b370e9c5.filesusr.com/ugd/b926a8_bfac93f9bfcd4277822fe7a4be431b4d.pdf?index=true
    • https://ee4bb60c-ddc5-40f5-8ece-1892d4b9bb55.filesusr.com/ugd/fd4c29_671a14a98c3746f5a1d8cf97cc399a0b.pdf?index=true
    • https://5ac46288-3057-47f9-93cb-f9116e779109.filesusr.com/ugd/aef5b7_e245803b8b1c4bb48c9706064273bbf9.pdf?index=true
    • https://cba23d9f-93f6-4a7a-92c3-c4cb8a3e8d70.filesusr.com/ugd/89602e_c27b72734ab3458b8978ca2776c1aed7.pdf?index=true
    • https://a388b139-f6e0-4ca0-8935-bbce6ca40fcc.filesusr.com/ugd/974a4e_d5e5139f49f94683a41ef1ba4b275f36.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0443/5968/0156/files/epidemiologia_analitica_definicion.pdf
    • https://12fc80f6-b584-47b1-b0b1-2d5cff43a17f.filesusr.com/ugd/bc0b97_fc7307a1090440a79d9b582d3c444e87.pdf?index=true
    • https://27144924-e31e-4a09-b06b-5c81785547b8.filesusr.com/ugd/5f226b_55544cf017774a32ba92aac2710c6ec6.pdf?index=true
    • https://437236ff-6a11-49f6-b8af-8b51d3953105.filesusr.com/ugd/031dda_29123ac1f4e94bd78b34e090b4adbbde.pdf?index=true
    • https://a7ebb2a9-e15d-4477-8461-a089372cacdd.filesusr.com/ugd/221eaa_de37bc24ff314d2db4b9a2c57fbf49ec.pdf?index=true
    • https://3a856c0d-4055-4a5d-b935-74a6803974f2.filesusr.com/ugd/3225da_28eb47b3f65c4ceeb885104b84ad6800.pdf?index=true
    • https://8233dc66-9929-4b18-a290-1dc3b8d8e69a.filesusr.com/ugd/c4f63d_cd71d973d370499ba4fc26c0c4723f82.pdf?index=true
    • https://924a8f47-d855-4dd2-af8e-ef00be04c214.filesusr.com/ugd/fb5067_f4ba6d40f7b745c78b7974c00e93439d.pdf?index=true
    • https://468a6eb5-8586-4a86-b60c-6bee64e84b06.filesusr.com/ugd/610d21_30f0fd092b594a128a76266673c7e74e.pdf?index=true
    • https://1570acfc-617c-4388-a547-1892b55f36f4.filesusr.com/ugd/7cefa9_0d0f1f9901d84fffa5097fc14ff91c6c.pdf?index=true
    • 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/
    • https://468a6eb5-8586-4a86-b60c-6bee64e84b06.filesusr.com/ugd/610d21_30f0fd092b594a128a

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069d4.bin
27f9680843d0db11f218306e322a61dc9d42f6cd998216d6a70ce4ddd384eb0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69D4 5300 bytes
font_01_sfnt_off00007bae.bin
f77cd92d78f10795681e1d8a43bc83b7527ce4791001dc83af65fd3763ae774d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAE 10384 bytes

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