Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6f8768d4e32afc…

MALICIOUS

PDF

39.3 KB Created: 2020-09-01 05:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bb1c97bf688385a359a0af92520bf83 SHA-1: fd715245ea7ae6f5b2d0517c56b93e1aa6f366d5 SHA-256: 0c6f8768d4e32afc39dff18189e2eb18079ebd10848dd231deb6b6c847810c7b
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to an 'annual general meeting letter format' and includes the malicious URL. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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/wix?keyword=annual+general+meeting+letter+format
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/boeing_aircraft_performance.pdf
    • https://cdn.shopify.com/s/files/1/0431/0450/1922/files/sekad.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5078/files/jowafamox.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/android_color_xml.pdf
    • https://cdn.shopify.com/s/files/1/0439/6980/6494/files/linux_command_cheat_sheet_sans.pdf
    • https://static.usrfiles.com/ugd/d1d005_ac3355987eb84a469c312decd3adf306.pdf
    • https://cdn.shopify.com/s/files/1/0438/6832/4005/files/valubej.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/ojt_application_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/3337/0522/files/ulcera_peptica_perforada.pdf
    • https://cdn.shopify.com/s/files/1/0458/3106/1667/files/calibre_2._1_surtada.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/zaxewerumovesujuxexalaro.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/advanced_english_arabic_translation.pdf
    • https://cdn.shopify.com/s/files/1/0429/3338/7423/files/body_boss.pdf
    • https://cdn.shopify.com/s/files/1/0438/5275/9190/files/cable_gland_size_chart.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_off00005e30.bin
1e5680ad4c396b8ffb1d777e882ce2d2fff738932232d0280167286cf609c81c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E30 4900 bytes
font_01_sfnt_off00006ec6.bin
dd9a3963f714954e437ef0f66849f87800f9a239df5c680ded5cbacc4c844aaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC6 9844 bytes