Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed158e48fd2f436…

MALICIOUS

PDF

49.2 KB Created: 2020-08-10 18:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a1726c1e2886fdedd451b0f38cfba15 SHA-1: 713c0d55fdcbcb172d848be534e13e4bd5a620e5 SHA-256: eed158e48fd2f436e6c436373de341a6f15652deeff34531cb17dc2ce73cd9a4
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'critical thinking exercises' and the malicious URL, suggesting a lure. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to malicious infrastructure.

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/pify?keyword=critical+thinking+exercises+for+university+students+pdf
    • http://files.creepingmuseum.com/uploads/1/3/2/6/132681482/rusatikuredol_vapojavesena.pdf
    • http://files.susangeddes.com/uploads/1/3/1/4/131453124/7020028.pdf
    • http://files.nosilafacepainting.co.uk/uploads/1/3/0/7/130775897/387ce55f1.pdf
    • http://files.kaylongden.com/uploads/1/3/1/4/131482853/4932746.pdf
    • https://cdn.shopify.com/s/files/1/0437/1732/9064/files/finadezenevigobe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0355/9583/files/ordinal_numbers_worksheet_for_grade_3.pdf
    • https://cdn.shopify.com/s/files/1/0431/5647/1970/files/future_dirty_sprite.pdf
    • https://cdn.shopify.com/s/files/1/0434/8307/0629/files/bifafamepusa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8200/6171/files/wixeri.pdf
    • https://cdn.shopify.com/s/files/1/0432/3147/7922/files/xifinogis.pdf
    • https://cdn.shopify.com/s/files/1/0431/1502/0448/files/sepirew.pdf
    • https://cdn.shopify.com/s/files/1/0437/6245/0586/files/30365042157.pdf
    • https://cdn.shopify.com/s/files/1/0447/3788/8410/files/naming_alkanes_practice_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/fefinebafonidukexotafi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9777/6543/files/ratovulivelekubose.pdf
    • https://cdn.shopify.com/s/files/1/0434/0491/8941/files/code_for_transparent.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_off00007285.bin
47e6c145ce3e0bd623bb062e6a89c4f4c6063214156e300ce5176aa21dce1959		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7285 5616 bytes
font_01_sfnt_off000085a4.bin
5ca1d274fc8627df595729e028890aff4ebfb6e355194e2cfa9e851401155a76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85A4 10292 bytes
font_02_sfnt_off0000a8fa.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8FA 4324 bytes

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