Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c15839271a2912…

MALICIOUS

PDF

45.9 KB Created: 2020-08-19 15:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c50ad62e3bc86ea537581944db2af194 SHA-1: 66bb7ab1aece3b900633ccb6560127152d1a6248 SHA-256: 26c15839271a2912abc29dfb0173b20a42ab6899d6b7fe505e7ef703accbad3a
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to what appears to be a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to download further malicious content. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=mathematics+printable+worksheets+for+kindergarten
    • http://files.tuscanystudios.com/uploads/1/3/2/6/132681482/8570032.pdf
    • http://kiruka.coachhousecattery.co.uk/uploads/1/3/0/7/130775350/636fb3.pdf
    • http://files.stamellstring.com/uploads/1/3/2/8/132814250/nogedegiliwedatet.pdf
    • http://files.davidharriscollection.com/uploads/1/3/1/4/131408100/28014.pdf
    • https://cdn.shopify.com/s/files/1/0432/0090/5380/files/zipibexi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5111/4908/files/acer_drivers_pack.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1908/files/aithey_aa_background_music_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0432/8197/3416/files/south_park_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/kizomalerujitubinotono.pdf
    • https://cdn.shopify.com/s/files/1/0431/7347/8560/files/apache_tomcat_8._5_for_windows.pdf
    • https://cdn.shopify.com/s/files/1/0437/6900/4190/files/acc_guidelines_for_heart_failure.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3834/files/xijogipubupifubotelowu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6423/9014/files/no_puedo_acceder_a_icloud_desde_android.pdf
    • https://cdn.shopify.com/s/files/1/0436/1905/7822/files/98856856407.pdf
    • https://cdn.shopify.com/s/files/1/0434/5335/0053/files/nijofazato.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_off00006543.bin
702f03cb0c50faef44e8a243dce95a036e7f22af15e471b737149a80b7199c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6543 5660 bytes
font_01_sfnt_off00007864.bin
c6214e21e3b4d6be6521efa3dd4ec364552d6f74725132da97e6c338b1c54b3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7864 10396 bytes
font_02_sfnt_off00009be9.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BE9 4324 bytes

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