Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b15b2751206b2ce…

MALICIOUS

PDF

38.0 KB Created: 2020-08-13 06:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54ea45bd6336f9a00c4f7f44f099933b SHA-1: a1f5166b91c421dc269bfdef7cdac203e4e3e049 SHA-256: 7b15b2751206b2ce19c3e9ad9c87561065b69a98f615f45aff67c83a607bbcee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, while appearing to be educational content, is a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

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.ru/wb?keyword=noun%20phrases%20worksheet%20for%20grade%205
    • http://negok.first5460.com/uploads/1/3/1/4/131408970/peligoxakagoxaxilo.pdf
    • http://files.mshaileyswebspace.com/uploads/1/3/0/9/130969053/dedaresas_sepero_rokawerewazo.pdf
    • http://files.9thmediumregimentra.com/uploads/1/3/0/7/130776589/fanomemen_zagajusesufafud_supinabosepete.pdf
    • http://files.tennisunderthestars.net/uploads/1/3/0/8/130814387/dofepisipexotux_kejeseziwod.pdf
    • http://files.sarahcbenjamin.com/uploads/1/3/1/4/131437977/1653934.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8058/1274/files/58096544798.pdf
    • https://cdn.shopify.com/s/files/1/0433/8833/8330/files/61509914089.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/jukasilukoruwowovamu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8849/4236/files/barracuda_heart_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0428/6247/7479/files/cuales_son_los_derechos_del_nio_y_adolescentes_peru.pdf
    • https://cdn.shopify.com/s/files/1/0435/1551/0938/files/aquaculture_engineering_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/38343767218.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/76540342803.pdf
    • https://cdn.shopify.com/s/files/1/0430/0655/8359/files/tobimujuwizosaruxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/rurixivegomapurema.pdf
    • https://cdn.shopify.com/s/files/1/0435/5099/8679/files/design_techniques_in_software_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/wiwiz.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_off00005511.bin
1d08c400bc71ccb4f679b12296aeb02495baccd749975a1e22aec2a282f78d9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5511 5520 bytes
font_01_sfnt_off000067ec.bin
f0100b7ca7ca360c6c2e27f98da3e5d1a9f03fb9a997bb086908162dc7751074		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67EC 10328 bytes

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