Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb9305558020d24…

MALICIOUS

PDF

41.0 KB Created: 2020-08-09 02:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b6848923baec96cb85cc6cb3dd87e66 SHA-1: 8c792f851fbe56e057c72474072dbf02b61cb2b8 SHA-256: 5eb9305558020d248f178fdf02fe668efadfb75a3ce2c36573689e9b1dbd5d2c
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.com/pify?keyword=abrsm+piano+grade+5+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to malicious infrastructure. The presence of numerous other PDF links further indicates a link farm or redirection scheme.

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=abrsm+piano+grade+5+pdf
    • http://files.adaelementarypto.com/uploads/1/3/1/0/131071056/jejuxi.pdf
    • http://files.transformedbymercy.net/uploads/1/3/1/4/131452944/293652b27a5.pdf
    • http://files.didsburyjuniors.com/uploads/1/3/2/6/132681824/maxipupamekep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/48603283215.pdf
    • https://cdn.shopify.com/s/files/1/0428/7922/1919/files/nitaxezoderifevanadakex.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/999426901.pdf
    • https://cdn.shopify.com/s/files/1/0434/6131/2676/files/test_czasy_teraniejsze_angielski.pdf
    • https://cdn.shopify.com/s/files/1/0429/1218/6531/files/history_of_muslim_civilization.pdf
    • https://cdn.shopify.com/s/files/1/0429/5789/7882/files/xifileme.pdf
    • https://cdn.shopify.com/s/files/1/0434/4473/2065/files/29244290285.pdf
    • https://cdn.shopify.com/s/files/1/0429/5655/4394/files/42154586852.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/nesuxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/culinary_institute_of_america_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0427/9464/7719/files/26756838546.pdf
    • https://cdn.shopify.com/s/files/1/0433/9302/4158/files/loxutijetazipulexad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9236/1887/files/gewepegezebulumiveju.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005108.bin
629b003174d2cc41f908dc921a64fdb553a3f996b2a5c8a5066360d72d87c976		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5108 4632 bytes
font_01_sfnt_off0000613e.bin
3f70e5e84d64b1e7a3e9eecdaea4e7dcd7ce964746f72319adee745aab386fd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x613E 5584 bytes
font_02_sfnt_off0000741e.bin
9d0318926611a44e89ad5f1e12fb167a0e60ca5a92cf238f444bfdb2c3a64ad1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741E 9708 bytes

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