Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db7b6689cabfb56…

MALICIOUS

PDF

42.4 KB Created: 2020-08-24 16:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43390f9b25a38abaf102514aa73310ac SHA-1: 8092cfdc3a2b4d58e925d4dde324e39dd5a19446 SHA-256: 3db7b6689cabfb569f4059f21e8a1267cdc9fe87c744d509de3fbcfcc55111ba
120 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.cc, disguised as 'nata aptitude test sample papers with answers'. This indicates a phishing or social engineering attempt to direct the user to malicious content. The file also contains a large number of embedded links, many pointing to Shopify, which is characteristic of SEO link farm abuse to improve search engine ranking for malicious content.

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=nata+aptitude+test+sample+papers+with+answers
    • http://files.walleycreeknanaimo.org/uploads/1/3/0/7/130775413/7984327.pdf
    • https://cdn.shopify.com/s/files/1/0436/4517/3910/files/1159766510.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/24641187772.pdf
    • https://cdn.shopify.com/s/files/1/0437/9816/7713/files/78220615053.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/business_intelligence_course_outline.pdf
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/diwukeki.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/adobe_photoshop_7._0_tutorials_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3413/files/imitate_their_faith.pdf
    • https://cdn.shopify.com/s/files/1/0462/2224/6042/files/bukunmi_audio_songs.pdf
    • https://cdn.shopify.com/s/files/1/0433/1818/2041/files/86163494041.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/pdf_splitter_page_range_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/8179/3698/files/sujabete.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_off00006742.bin
ff3801239e74e658ed4ced8f2445cf943609851264ba6174c7231104c9c6318d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6742 5260 bytes
font_01_sfnt_off0000790b.bin
e99ae4e8a3b1e935a6345067b3818e7186089cd0d554464555b0403f49a97a67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790B 10480 bytes

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