Malicious PDF — malware analysis report

Static analysis result for SHA-256 335b28494ef9ae54…

MALICIOUS

PDF

64.6 KB Created: 2020-08-21 05:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 404c1556db7204a4fde3a9e4aab3f2fd SHA-1: 4e6a97a97c3172cb3679a8d410da2e0ccc330bfb SHA-256: 335b28494ef9ae54fb56005d28c5ade1c6290ef517099e4ca7aaf165faf986ae
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic firing indicates a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=teachers+day+speech+in+assamese+language+pdf', suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, also contains this URL and other PDF links, reinforcing the attack pattern of a link farm designed to lure users to potentially harmful sites.

Heuristics 3

  • 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.
  • 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/pify?keyword=teachers+day+speech+in+assamese+language+pdf
    • http://derakes.hardstoneresources.com/uploads/1/3/1/3/131383591/1114726.pdf
    • http://kuvudir.fathersofthedarkknight.com/uploads/1/3/1/6/131606289/5fa440e90e81.pdf
    • http://files.whs12885.org/uploads/1/3/1/4/131409017/d3802dd9.pdf
    • https://cdn.shopify.com/s/files/1/0429/5789/7882/files/pag._ibig_online_registration.pdf
    • https://cdn.shopify.com/s/files/1/0433/9512/1301/files/reported_cases_of_naegleria_fowleri_in_canada.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/77573165491.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/54482733047.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3929/files/25738321497.pdf
    • https://cdn.shopify.com/s/files/1/0432/3426/3199/files/17544885860.pdf
    • https://cdn.shopify.com/s/files/1/0434/5046/6464/files/astounding_science_fiction_magazine.pdf
    • https://cdn.shopify.com/s/files/1/0447/3470/9914/files/alginac_1000_bula.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6702/files/army_comsec_incident_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/5347/2151/files/gasimipofovojuro.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_off000071ea.bin
1749cc58412e86f3c7e3e07b97d085298ef94c8b416a0e5026c1d460a78e2a6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71EA 5620 bytes
font_01_sfnt_off000084e3.bin
af0df03c90d945b2d4bfe2715c258019866b2214406ef0d7f8f705120d8b4ce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84E3 15856 bytes
font_02_sfnt_off0000b631.bin
6436214169b01c95aa4e7afad8a6a3267c933459c02c19a7dfb487bc885f5cd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB631 4152 bytes
font_03_sfnt_off0000c574.bin
51786a4a33cf5ed6c08afa9aa17fe14ee6ebc8aed48683fa7a274e094cf04c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC574 15348 bytes

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