Malicious PDF — malware analysis report

Static analysis result for SHA-256 069da371876a44e8…

MALICIOUS

PDF

47.6 KB Created: 2020-08-12 16:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bd1478dcb6246ac388435485c458828 SHA-1: 4039eee72440e046af3d2fb0f7e52c145cfe1d5e SHA-256: 069da371876a44e889e8af1f4171b85b3e6963320690881670bcc19600e8fc70
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure. The primary malicious URL identified is 'https://ttraff.cc/wb?keyword=identifying%20verbs%20worksheet%20high%20school', which is likely used to lure victims into downloading further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

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/wb?keyword=identifying%20verbs%20worksheet%20high%20school
    • http://gaxag.nycmoneymavens.com/uploads/1/3/0/7/130775085/557267b99bd.pdf
    • http://zerokafu.jacksonbrownentertainment.com/uploads/1/3/1/4/131408970/zawodi.pdf
    • http://gisosos.aimusa.info/uploads/1/3/0/8/130874493/watikinav.pdf
    • http://nekepu.koolauloacalendar.org/uploads/1/3/1/8/131871921/tifenupid.pdf
    • http://files.thorntongreg.com/uploads/1/3/0/9/130969498/daxasevakimolo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4765/6343/files/8810080318.pdf
    • https://cdn.shopify.com/s/files/1/0435/8920/6174/files/36330526728.pdf
    • https://cdn.shopify.com/s/files/1/0430/7612/4821/files/pdf_encyclopedia_of_modern_bodybuilding.pdf
    • https://cdn.shopify.com/s/files/1/0428/9773/5843/files/66928637294.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/geligup.pdf
    • https://cdn.shopify.com/s/files/1/0431/7741/0720/files/64654481810.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6412/files/awg_to_mm_chart.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/gelonumimotojeveg.pdf
    • https://cdn.shopify.com/s/files/1/0429/7005/4805/files/genki_2nd_edition_workbook_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0432/9557/2126/files/95306867772.pdf
    • https://cdn.shopify.com/s/files/1/0430/6341/0845/files/76961069358.pdf
    • https://cdn.shopify.com/s/files/1/0432/1506/1153/files/lawutozu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5726/5305/files/34075996925.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/areas_of_artificial_intelligence.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zaxolaxowixinetubosi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c30.bin
db53d89e5ebff6449a41cdf7dabec438c6c7e17dc8dfab9ae0ac37209d2f167c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C30 5468 bytes
font_01_sfnt_off00008ee2.bin
5c37ccd16aaba8523ef290391136e1fcd966879a9c6206160b97e1fa4cd568cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EE2 10044 bytes

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