Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a5727217ef1d8f…

MALICIOUS

PDF

50.1 KB Created: 2020-08-30 18:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ef4be5f80f40ba0a82e8668a5fa274e SHA-1: a28788f1ce440f1170b1b0e2567611a26616105e SHA-256: a3a5727217ef1d8f7615ccf392c4f0605a3167e156e18741c7bb0311733549b9
152 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, pointing to 'https://ttraff.com/wix?keyword=c%25C3%25B9ng+b%25C3%25A1+%25C4%2591%25E1%25BA%25A1o+thi%25E1%25BA%25BFu+gia+h%25C3%25A0ng+ng%25C3%25A0y+%25E1%25BB%259F+ch'. Additionally, another critical heuristic indicates a PDF link farm, with multiple embedded URLs. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be garbled text, but the embedded URL is clearly visible and is the primary vector for malicious activity.

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/wix?keyword=c%25C3%25B9ng+b%25C3%25A1+%25C4%2591%25E1%25BA%25A1o+thi%25E1%25BA%25BFu+gia+h%25C3%25A0ng+ng%25C3%25A0y+%25E1%25BB%259F+ch
    • https://static.usrfiles.com/ugd/47b1e8_9504968889844fe4a72391f27b65610b.pdf
    • https://static.usrfiles.com/ugd/b8c837_de519511f77a4c08a3ccf7fc9737d993.pdf
    • https://static.usrfiles.com/ugd/9cc572_794cdaa02256455c8db7f18cd2130ec5.pdf
    • https://cdn.shopify.com/s/files/1/0431/0492/7905/files/caballo_de_troya_6.pdf
    • https://cdn.shopify.com/s/files/1/0432/0460/8155/files/fegobab.pdf
    • https://static.usrfiles.com/ugd/b8c837_352760b18915450b8498e5fa2d09abc4.pdf
    • https://static.usrfiles.com/ugd/c12414_a5384cddaea3409eaf4b9de31aebe0f4.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_1d8c8e404efa4ece8b4ecbaa29d5c24d.pdf
    • https://static.usrfiles.com/ugd/36f25b_3c16f57ec3c94c298deb76fd0633ddea.pdf
    • https://cdn.shopify.com/s/files/1/0466/4220/0741/files/get_your_guide_berlin_contact.pdf
    • https://cdn.shopify.com/s/files/1/0434/0432/9125/files/xerebabokisun.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_off00004f6d.bin
a35a81ce6c3dba65e69e78e85bba172f2b728c357bddd416f0119e50b0e397e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F6D 5772 bytes
font_01_sfnt_off00006340.bin
2475b4086939cf50da047966b129898049df392ca72c159176e74347eb5e1581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6340 6236 bytes
font_02_sfnt_off00007627.bin
5faefd7711c32a141bfe273ae4d6413bdf1b849bab6e47f244a62d3d41bcfb52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7627 20392 bytes
font_03_sfnt_off0000a3a3.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3A3 16092 bytes

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