Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bfc8a1d2bbceab…

MALICIOUS

PDF

45.5 KB Created: 2020-09-12 08:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35e854bed9b2c04ac26fa691647d6761 SHA-1: 39eb5286ae8350262da8a9b484fe5d8151f4322a SHA-256: b1bfc8a1d2bbceab30786e35475d1b21f44aa14617c15aa600095da2b6441ae0
140 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector infrastructure. The document body text, though heavily obfuscated, contains the URL "https://ttraff.me/wix?keyword=zalo+pc+64+bit", suggesting a lure to download potentially malicious software. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm designed to improve search engine ranking for malicious content. No scripts were extracted from this sample.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.me/wix?keyword=zalo+pc+64+bit
    • http://files.surprisedbypurpose.com/uploads/1/3/1/8/131871852/8614b633834b70c.pdf
    • http://files.metaradiant.org/uploads/1/3/0/7/130775688/luseworexe_nimazumon_pinum_vudowagoja.pdf
    • http://tizusonog.nutripol.org/uploads/1/3/0/8/130873822/3904238.pdf
    • http://files.o-wright.com/uploads/1/3/1/4/131406649/b54cfaddb6db7e.pdf
    • http://jozubiduv.grizzinator.com/uploads/1/3/1/3/131398225/174900.pdf
    • https://cdn.shopify.com/s/files/1/0440/2891/9973/files/wesobuwuralexupigo.pdf
    • https://cdn.shopify.com/s/files/1/0461/0955/6899/files/wimerewibajawesukabop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/medade.pdf
    • https://cdn.shopify.com/s/files/1/0427/7967/2735/files/carl_s_jr_beyond_burger_nutrition_information.pdf
    • https://cdn.shopify.com/s/files/1/0428/3095/4655/files/zotuzibufinilugivagep.pdf
    • https://static.usrfiles.com/ugd/5be868_44168abc06c84ea2b82a412dde2f609e.pdf
    • https://static.usrfiles.com/ugd/07625c_27106ee366664316bf0dc9172b57c48e.pdf
    • https://static.usrfiles.com/ugd/c33f71_c53d27b434044c1d9c5b6023c22030ac.pdf
    • https://static.usrfiles.com/ugd/735189_c3528c1949a845439101b89e5e0581c6.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_off0000758a.bin
6ecd8c16e654eb94775973de0e651441b64b56b00563564daf5980242c1990e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x758A 4992 bytes
font_01_sfnt_off000086a1.bin
42092a38493319e65aa6db7734a22f292edcdf0b46c05ea1d603505b1aeff6f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A1 10080 bytes

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