Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a269b54730d5a3e…

MALICIOUS

PDF

39.1 KB Created: 2020-09-01 03:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee93920453a159c4def437dead5dd95b SHA-1: 24c6ca0bf90111856fdcf361c2c6ac0872c5e9dd SHA-256: 8a269b54730d5a3e5069f4146bc6f36836c963655ea67559ba20e1a437dd47de
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. Additionally, another critical heuristic identified it as part of a PDF link farm, with numerous external links. The primary malicious URL identified is https://ttraff.cc/wix?keyword=convertible+note+term+sheet+sec. The document body, though heavily obfuscated, contains this URL and other benign-looking PDF links, suggesting a lure to a malicious site.

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/wix?keyword=convertible+note+term+sheet+sec
    • https://static.usrfiles.com/ugd/b8c837_4bd0d1aa19874c7d9cbbf58e5ae403fd.pdf
    • https://static.usrfiles.com/ugd/12f4eb_f15534e2afaa42ab9996586a1f294e4e.pdf
    • https://static.usrfiles.com/ugd/b5aed9_3f44fd135c814f4e8097dec231ff6a78.pdf
    • https://static.usrfiles.com/ugd/88a84f_8fc01f0a54f54234bcb10fb6724852c1.pdf
    • https://static.usrfiles.com/ugd/6cf0f5_99018926beda4df3b135fec187a480f4.pdf
    • https://cdn.shopify.com/s/files/1/0449/6012/0991/files/printable_my_little_pony_coloring_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7494/files/katedaso.pdf
    • https://cdn.shopify.com/s/files/1/0432/4127/5547/files/38736694306.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9460/files/28060457784.pdf
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/kefisawiwakovexodotizata.pdf
    • https://cdn.shopify.com/s/files/1/0429/0940/1251/files/vukivizaxokabonuziwed.pdf
    • https://static.usrfiles.com/ugd/b8c837_95797f8b807143c5af5fd41e7d5949e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_39031162c1a244c890e29b41318ea892.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_f3d4c0b5d3ec438aa9cfcf476a9472ae.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e14.bin
436d9eef9031a4832204cfa9dfe2d27bb0365e185dbcd4f1e1532cc9c1d0e1f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E14 4932 bytes
font_01_sfnt_off00006eb9.bin
0a0fd1b7eca58f6d80b8b94a0f2f2da8c093c3287ada06ac1cd621290f0e5d7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB9 9660 bytes