Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c04826933329b1…

MALICIOUS

PDF

40.9 KB Created: 2020-08-12 13:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26a25cf590c505438dca7889352f1518 SHA-1: 31b196a43263084c4324b2efbf5ed11b9d26b83e SHA-256: 01c04826933329b10f640526562fcf8c3df982cd34b9b0136774e277cc007ec9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a high number of embedded links, many pointing to external resources, and one specific URL is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting it's part of a lure to redirect users to potentially 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=crybaby%20wah%20535q%20manual
    • http://zedif.nepalschoolprojects.ca/uploads/1/3/1/4/131453247/nojopim.pdf
    • http://files.ranchatwest40.com/uploads/1/3/0/8/130813906/9062179.pdf
    • http://files.apafss.org/uploads/1/3/1/3/131378821/9993804.pdf
    • http://jusus.kaylynmariedunn.com/uploads/1/3/1/8/131871390/zamuwibov.pdf
    • http://files.nigelbrownjadecarver.com/uploads/1/3/1/4/131437724/lerepumumuseko-nisuxol-madawazugan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.pdf
    • https://cdn.shopify.com/s/files/1/0439/7744/1438/files/carnatic_music_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/8249/8716/files/gokuzokawedixevo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2739/files/60763024307.pdf
    • https://cdn.shopify.com/s/files/1/0435/3946/4341/files/tipim.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/tokitanutisexad.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/46799808910.pdf
    • https://cdn.shopify.com/s/files/1/0432/1761/7057/files/zuwufevewixo.pdf
    • https://cdn.shopify.com/s/files/1/0440/8036/5733/files/ramadan_calendar_2020_durban.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/kadukolopudix.pdf
    • https://cdn.shopify.com/s/files/1/0434/8814/9654/files/83674858863.pdf
    • https://cdn.shopify.com/s/files/1/0431/7049/6661/files/passive_all_tenses_worksheet.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_off00005490.bin
2c6d9846c3b35732582bb136a891af3184c79ca9763e9c62f20cfd726a0a8c86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5490 5044 bytes
font_01_sfnt_off0000659c.bin
ca3ee53130485169c0ccfa8b451481f0a93c39e92e5c533dabbbe328b0f3f2ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x659C 10200 bytes
font_02_sfnt_off0000889b.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x889B 4324 bytes

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