Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8436bde5da3ab84…

MALICIOUS

PDF

42.8 KB Created: 2020-08-18 22:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1e931073c5da397c7e2c897c5d088a6 SHA-1: 1f9781bbfd9ec689dfe6f83dc37a41fecce212b9 SHA-256: d8436bde5da3ab84b52a7bbfef9761f440f00f023ef68fc04ecbba32acf49880
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised with a book title keyword. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this malicious intent. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of links to external PDFs, suggesting a link farm or distribution mechanism. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector is the primary indicator of compromise.

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.com/pify?keyword=making+a+play+abbi+glines+epub
    • http://wufiti.phaccounting.co.uk/uploads/1/3/0/7/130776485/2295319.pdf
    • http://files.burninroseranch.com/uploads/1/3/1/3/131379899/bagubabavoxexa-xubutuporigasub.pdf
    • http://files.planodeckandfence.com/uploads/1/3/1/0/131071063/0c229b.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2092/files/spiritual_warfare_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/9212/4572/files/19089885060.pdf
    • https://cdn.shopify.com/s/files/1/0434/0082/2934/files/20000395932.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/kixomumid.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9722/files/anaesthesia_for_craniotomy.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5737/files/fedex_freight_airbill.pdf
    • https://cdn.shopify.com/s/files/1/0432/0883/5229/files/togugemopin.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4900/files/mapa_politico_portugal.pdf
    • https://cdn.shopify.com/s/files/1/0434/7202/7814/files/5181126283.pdf
    • https://cdn.shopify.com/s/files/1/0431/9926/6979/files/lafekopaxorewuponefege.pdf
    • https://cdn.shopify.com/s/files/1/0440/6686/5302/files/rodefobujexatodizog.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/diccionario_biblico_adventista_parte_2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ced.bin
8294c58dfe4d740f03824fa668a9225ae305cf9c4fa004db8521d9e048b0e862		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CED 4892 bytes
font_01_sfnt_off00006da5.bin
390957d48d21d6257b142433dd325335722655ac7c1a12ae8bc3d955c6b84b49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA5 10156 bytes
font_02_sfnt_off00009055.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9055 4324 bytes

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