Malicious PDF — malware analysis report

Static analysis result for SHA-256 15eea2ad83a3c4ef…

MALICIOUS

PDF

47.8 KB Created: 2020-08-15 13:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c1c5f49f0382d8ef9f8cbfe80574f27 SHA-1: b7ebaf303c0a263a454e78413acbc8c291b1adb1 SHA-256: 15eea2ad83a3c4ef10b58c53033500f504f8e235735f2b06634eafac014ca067
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.cc/wb?keyword=cursive%20penmanship%20worksheets'. It also exhibits characteristics of a PDF link farm, with numerous embedded links, many of which point to benign Shopify URLs but also include other unknown domains. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=cursive%20penmanship%20worksheets
    • http://files.austlinq.com/uploads/1/3/0/7/130739779/eb2e7bfbfca.pdf
    • http://files.crutchfieldshawaiiankenpo.com/uploads/1/3/1/3/131383953/0646119036c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/1712/6567/files/3118014954.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4917/files/11545805820.pdf
    • https://cdn.shopify.com/s/files/1/0440/7577/8198/files/peanuts_theme_song_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/3123/1655/files/72672998111.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/application_letter_for_lecturer_position.pdf
    • https://cdn.shopify.com/s/files/1/0432/1912/4382/files/taromesikajekugad.pdf
    • https://cdn.shopify.com/s/files/1/0438/3444/1890/files/doderis.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/29126507648.pdf
    • https://cdn.shopify.com/s/files/1/0431/2770/1655/files/sagalov.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/58748156059.pdf
    • https://cdn.shopify.com/s/files/1/0434/8166/1600/files/56410767947.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7911/files/data_analysis_ebook.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ff3.bin
6df50a4d951b08066b794e42132c3e01ee85311fa6a4f39084ccc52301f0ba51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF3 5148 bytes
font_01_sfnt_off0000815e.bin
6e8e083757c01ff3b7740ad26acb61f010a42494cdbc95120f594640191dd531		 pdf-font-stream PDF embedded font (sfnt) at offset 0x815E 10156 bytes
font_02_sfnt_off0000a422.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA422 4324 bytes

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