Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad3ef0097b94cc8…

MALICIOUS

PDF

42.1 KB Created: 2020-08-02 05:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a080aed03752c30bedefcce607806b0 SHA-1: e68a9021580b412f2c07767383606a0b5abec558 SHA-256: 0ad3ef0097b94cc871736b2a6102480369ef1d54a65fb5d553345633c1138e65
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm. One of the primary links, 'https://ttraff.cc/pify?keyword=blank+multiplication+chart', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to these URLs, suggesting an attempt to drive traffic or distribute further content.

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=blank+multiplication+chart
    • http://files.olphlindenhurst.com/uploads/1/3/0/7/130776100/funorotigiju.pdf
    • http://files.gracetotheground.com/uploads/1/3/1/3/131379496/888574fb6.pdf
    • http://files.christiestimber.com/uploads/1/3/2/3/132302815/a80bec9c772bc.pdf
    • http://files.sonoma-chanson.net/uploads/1/3/0/9/130969580/bccc9b6052356a.pdf
    • http://files.illustratebrandz.com/uploads/1/3/2/7/132710624/2933648.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8990/3259/files/lobibumebefazamuzilawe.pdf
    • https://cdn.shopify.com/s/files/1/0429/0579/6774/files/digododagujumiteterali.pdf
    • https://cdn.shopify.com/s/files/1/0431/5349/0071/files/5793278385.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8080/files/fotixoregozimezirulagagi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/tosujaxexepaminu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/53940599110.pdf
    • https://cdn.shopify.com/s/files/1/0431/6567/9776/files/kokiri.pdf
    • https://cdn.shopify.com/s/files/1/0438/5413/5456/files/free_torrent_sites.pdf
    • https://cdn.shopify.com/s/files/1/0430/3834/3322/files/sigapusava.pdf
    • https://cdn.shopify.com/s/files/1/0428/5012/3943/files/jevixo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/guvifosizufefixiv.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067b8.bin
b47e11b87091d2400d916fd1a825caaec65d0a03ace4e7c6c3e2d72edc1d5d9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B8 5108 bytes
font_01_sfnt_off000078ee.bin
b213fe2f595eee7dc8e8a8e02d29c9ec633108b254232a4688811c2d2e5377fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EE 10128 bytes

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