Malicious PDF — malware analysis report

Static analysis result for SHA-256 408ef44b765fe537…

MALICIOUS

PDF

77.2 KB Created: 2020-09-19 01:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3619fc3efcda1259b3d1d517e25ab5d SHA-1: 03616fae816d304c7e8ded4133b8d2880b9ba1a3 SHA-256: 408ef44b765fe537e073f54234569b5a09d7787abc358f4028df01b1b8dd0829
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The link leads to a URL that is part of a known malicious redirector infrastructure. The PDF also contains a large number of external links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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.link/wix?keyword=platform+revolution+pdf+free
    • http://files.malagpr.com.au/uploads/1/3/1/4/131411024/nitonepogos-taleligono.pdf
    • http://febujis.poetrygirlinc.com/uploads/1/3/1/3/131382030/2874873.pdf
    • http://nuzuridu.tangerinetales.com/uploads/1/3/0/9/130969406/7b0ae8089edcdb0.pdf
    • http://zozepoxe.applause-tickets.com/uploads/1/3/0/7/130775012/pugufivevofal-gekas-kimenotafelol-gunut.pdf
    • http://files.u2nesco.com/uploads/1/3/1/3/131381078/mezola.pdf
    • https://cdn.shopify.com/s/files/1/0481/6388/1115/files/26796604888.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/tuvepubakom.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7911/files/fuludoxosefajojikenanab.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5908/files/apc_back-_ups_pro_1500.pdf
    • https://cdn.shopify.com/s/files/1/0479/0760/2598/files/23913416177.pdf
    • https://cdn.shopify.com/s/files/1/0465/0598/4158/files/medanta_hospital_gurgaon_patient_reports.pdf
    • https://cdn.shopify.com/s/files/1/0484/2399/3496/files/casio_databank_calculator_watch_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/6905/5911/files/67794665645.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/62387261523.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/
    • https://cdn.shopify.com

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e450.bin
ba835c8830da4773207eaaa676158c80d658f03577f853d2b10013da480b86cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE450 4952 bytes
font_01_sfnt_off0000f50b.bin
5d6985d3fd387d35f904b9ab8c8e07ddf1388b5d81f5cd5df2f8af423fecf576		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 10572 bytes
font_02_sfnt_off00011910.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11910 4324 bytes

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