Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7b8bf1f09ac6f3…

MALICIOUS

PDF

41.6 KB Created: 2020-08-02 19:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2560020154849d1e2e94852f3bf5457 SHA-1: 65d39e36d086d7ac1d78955d1ceef95f9da3452c SHA-256: ac7b8bf1f09ac6f37e7abc27e4ab3d7996e51d15a82ddcc5ee8546adea21ced3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wb?keyword=kebakaran%20lahan%20gambut%20pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many of which are SEO-optimized and hosted on platforms like cdn.shopify.com. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the attack pattern.

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/wb?keyword=kebakaran%20lahan%20gambut%20pdf
    • http://files.lakelore.com/uploads/1/3/2/6/132682899/31c57a5ae707d65.pdf
    • http://files.northstarav.co.uk/uploads/1/3/0/7/130775592/9220818.pdf
    • http://files.tolgardgames.com/uploads/1/3/0/8/130874055/6836620.pdf
    • http://files.livingstondesigns.com/uploads/1/3/0/9/130969037/wenokubuduwon.pdf
    • http://files.artandsoulholton.com/uploads/1/3/0/8/130874325/ranak.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/resmed_airsense_10_clinical_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/96549063599.pdf
    • https://cdn.shopify.com/s/files/1/0431/6413/9669/files/nizinutabalipadesuwiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/22728515249.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21154843933.pdf
    • https://cdn.shopify.com/s/files/1/0432/7748/4196/files/using_voicemeeter_with_discord.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7569/files/10898809527.pdf
    • https://cdn.shopify.com/s/files/1/0429/6690/9081/files/insert_checkbox_in_excel_2016.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/mexexizuzusupawosinajefak.pdf
    • https://cdn.shopify.com/s/files/1/0428/1221/1359/files/94019259797.pdf
    • https://cdn.shopify.com/s/files/1/0431/8062/1984/files/77853446906.pdf
    • https://cdn.shopify.com/s/files/1/0429/2742/3654/files/92228482927.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/jemezirufukerupomut.pdf
    • https://cdn.shopify.com/s/files/1/0437/1942/6198/files/ditewikupetubogadab.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/
    • https://cdn.shopify.com/s/files/1/04

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000640b.bin
f98acab6ea228f3c931ae92e70ebd4b5a6d953132e2ea5677894574e671ec2a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640B 5448 bytes
font_01_sfnt_off00007668.bin
e6592781fbe3915590b4966e5f4e903d47b8ef199072e63c1466b9b867a1ca2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7668 10156 bytes

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