Malicious PDF — malware analysis report

Static analysis result for SHA-256 badb920a048d442d…

MALICIOUS

PDF

48.9 KB Created: 2020-08-04 10:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 124deaa45a6e584bafd239468b68ef41 SHA-1: 81528721b9550bd69afe009bb6a49ddddd0b80ba SHA-256: badb920a048d442d2c9dd2ed740d0fe3921332c4997f39b049335983ca56c4ff
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for IELTS speaking samples, and the embedded URL also reflects this theme. The presence of a link farm and the ML classifier's high confidence score further support the malicious nature of this document. The primary attack vector appears to be directing users to malicious sites via deceptive links.

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=ielts+speaking+sample+questions+and+answers+part+2+pdf
    • http://files.staceykennellynester.com/uploads/1/3/0/8/130814466/sodekabakixise.pdf
    • http://files.cantonfitnesscenter.com/uploads/1/3/1/4/131438437/7434290.pdf
    • http://files.earsl.org/uploads/1/3/1/6/131637419/nugelugejo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/xolavaxokoju.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2231/files/13892919026.pdf
    • https://cdn.shopify.com/s/files/1/0437/5507/7781/files/let_us_c_13th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0440/3019/7925/files/book_of_vile_darkness.pdf
    • https://cdn.shopify.com/s/files/1/0434/1992/6679/files/zowanilufud.pdf
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/32074885824.pdf
    • https://cdn.shopify.com/s/files/1/0430/8995/2922/files/60877362391.pdf
    • https://cdn.shopify.com/s/files/1/0434/2952/7709/files/manual_wheatgrass_juicer.pdf
    • https://cdn.shopify.com/s/files/1/0431/9232/0161/files/gafulixuzilelipelanaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7023/files/57532887452.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6119/files/zawubexesavim.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_off000063be.bin
ef4f694bcc01f9b2a7f06f628ffc063d542296daafe667f95627dce684e7975d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63BE 5712 bytes
font_01_sfnt_off00007732.bin
88ccdf9a41dad26f2bf9c2ae31ae42b5e7066700022b16b616543c38c07d6b96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7732 16472 bytes
font_02_sfnt_off0000a161.bin
3b1167557c0500c78008053c404847a906c4d495ef15adec583fc97e76626070		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA161 16068 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.