Malicious PDF — malware analysis report

Static analysis result for SHA-256 55edcfd406fa9dec…

MALICIOUS

PDF

51.2 KB Created: 2020-09-16 16:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 140da582acf0144c68b5973f5ef6ecd3 SHA-1: d29e0c77a1cd1be58be678e47552fc6213f2ab9d SHA-256: 55edcfd406fa9dec29ef94d7b32a3bc807b480f3496e54b7184d86473423c2e5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to distribute malicious content or lead to phishing pages. The primary attack pattern involves redirecting users to external, potentially harmful sites.

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.club/wix?keyword=community+minded+pathfinder
    • http://tebozilur.spiritusnw.org/uploads/1/3/0/7/130775288/gekatupasisazo.pdf
    • http://febumag.arkumc.org/uploads/1/3/0/8/130813668/a3dcdce39890.pdf
    • http://files.finaticsportfishing.com/uploads/1/3/2/6/132695694/77d36c74ab30baa.pdf
    • http://files.toastygoat.com/uploads/1/3/1/4/131452811/kumawiguzomojasow.pdf
    • http://peril.joewilford.com/uploads/1/3/1/6/131637503/3520257.pdf
    • http://pivovu.gordonstounartandphotography.com/uploads/1/3/0/7/130738948/mowazeworat.pdf
    • http://gikakop.mustardseeds.co/uploads/1/3/2/7/132740324/4205347.pdf
    • http://dipavepa.hannahtylerdesigns.com/uploads/1/3/2/7/132740837/569142.pdf
    • http://files.projectq.co.uk/uploads/1/3/0/7/130776162/75d9fdc0531.pdf
    • http://xivazorup.defendingthechristianfaith.org/uploads/1/3/0/7/130738625/b131aa371866f9.pdf
    • http://witan.mobilhicksville.com/uploads/1/3/2/7/132712109/abb19.pdf
    • http://files.icttg.com/uploads/1/3/0/7/130739183/9915664.pdf
    • http://files.intosai-faas.org/uploads/1/3/2/8/132815054/6182155.pdf
    • https://cdn.shopify.com/s/files/1/0431/3972/7509/files/daxavefuxizesiwutinewojul.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/goviwuluvefilosule.pdf
    • https://cdn.shopify.com/s/files/1/0439/1016/8744/files/clarinet_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/5676/6882/files/buzigilefegunusedilexam.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ab0.bin
f969f25ca7667ab34c2fab90fa0700d104d28cc596d04b08ead1e7df5a16ba16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB0 5076 bytes
font_01_sfnt_off00008bd4.bin
9b39edfbeff74ada9849aaccb317de82a9d4a6b92bef015b7f4c3d33de4e23a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD4 10916 bytes
font_02_sfnt_off0000b13f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB13F 4324 bytes

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