Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68f2fac643d154f…

MALICIOUS

PDF

48.0 KB Created: 2020-08-17 06:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec773726a6f5a4784bf324278e0ce44d SHA-1: 5ed98f341e8467f1da3a326c188a61fb3649ac12 SHA-256: b68f2fac643d154fb1d284a3d0a8b79a00f1b2bea5abee2c3c0b465c7aee719f
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, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=review+holika+holika+sheet+mask+pearl', is designed to redirect users to malicious infrastructure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=review+holika+holika+sheet+mask+pearl
    • http://zimabu.koolauloacalendar.org/uploads/1/3/1/4/131409508/5276787.pdf
    • https://cdn.shopify.com/s/files/1/0437/0087/9515/files/6249980678.pdf
    • https://cdn.shopify.com/s/files/1/0434/0200/2595/files/principles_of_auditing_full_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/2970/6390/files/the_human_brain_in_photographs_and_diagrams.pdf
    • https://cdn.shopify.com/s/files/1/0430/3739/3049/files/autism_spectrum_disorder_symptoms.pdf
    • https://cdn.shopify.com/s/files/1/0431/2684/9700/files/wuwesivotimonuxe.pdf
    • https://cdn.shopify.com/s/files/1/0440/1859/8038/files/tesis_de_aprendizaje_cooperativo.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/68111375004.pdf
    • https://cdn.shopify.com/s/files/1/0439/0925/1227/files/minedubibarivarakuvuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/66608300715.pdf
    • https://cdn.shopify.com/s/files/1/0430/2520/3354/files/bronchodilator_classification.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004648.bin
8cdc986817603179afe4ffbaade3c4ce6bf6ca576e5656bd77eba37ad5894865
pdf-font-stream PDF embedded font (sfnt) at offset 0x4648 5284 bytes
font_01_sfnt_off00005824.bin
1cb9ac5e437866f28a99642dcc3f286ffa053b4899a4a60ebf3cabe0b1301f99
pdf-font-stream PDF embedded font (sfnt) at offset 0x5824 8284 bytes
font_02_sfnt_off00006f3c.bin
3e3d6f444f2703ab7204361181dfeea6590556ab8a97b6c8fb11f739cdeb82c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3C 13968 bytes
font_03_sfnt_off00009b5a.bin
fc9675ab77dc38f778c28e9ac9efabd702f9a26a4e0ce91c28384496f54534e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B5A 16216 bytes