Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3cdc13d0db8e50…

MALICIOUS

PDF

39.2 KB Created: 2020-08-21 05:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9059623964a74ff494dcd1c5f801c57 SHA-1: 5c36b809a8d1a780a9951d589db39699eeed797f SHA-256: ae3cdc13d0db8e50c737a7277d84cb821043cff275821f760d232e47266396e3
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a chemistry worksheet, aiming to trick users into clicking it. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms this, and the ML_NYX_PDF_MALICIOUS score indicates a high probability of malicious intent. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics and IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=honors+chemistry+unit+conversions+worksheet
    • http://gifake.dceoralhistoryproject.org/uploads/1/3/0/7/130739845/98ab0ce00eeb.pdf
    • http://files.westfieldbouncehouserentals.com/uploads/1/3/1/3/131384789/4605166.pdf
    • http://files.friendsofsapl.org/uploads/1/3/1/4/131437147/5303602.pdf
    • https://cdn.shopify.com/s/files/1/0434/4794/3330/files/33746411162.pdf
    • https://cdn.shopify.com/s/files/1/0440/8419/9574/files/saxon_algebra_2_test_answers.pdf
    • https://cdn.shopify.com/s/files/1/0456/4808/5159/files/lowaxelawiko.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/rewozumepasevovubezosogux.pdf
    • https://cdn.shopify.com/s/files/1/0440/2587/2549/files/nazagumatalanofevaguri.pdf
    • https://cdn.shopify.com/s/files/1/0431/3602/4742/files/komovumavafalu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0811/4340/files/piwataku.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/wipubixejaj.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7256/files/11470697731.pdf
    • https://cdn.shopify.com/s/files/1/0429/2168/9254/files/66082813492.pdf
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/biology_notes_for_class_9_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7035/6632/files/ccna_textbook_download.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_off00004af7.bin
7bc92e048feda49e08103411185eb929e9e1231cb50e44624a658072e7418932		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AF7 4960 bytes
font_01_sfnt_off00005bb8.bin
e5cc86ebbc07cd50870be25428f5103ec95ea7f00dec93b948b240554bda151c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB8 12044 bytes
font_02_sfnt_off000081d8.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81D8 4324 bytes

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