Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cdf16bfa5cae53…

MALICIOUS

PDF

45.9 KB Created: 2020-08-30 02:40:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6508bcf6846956e733e68616b551df0c SHA-1: f851c14ac8ea0bbf173cdea23fe1d633ff84827a SHA-256: 57cdf16bfa5cae530f012b76810be6c8910db8b57685edbfd24423e3772dc0ba
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.club/wix?keyword=modern+chemistry+chapter+1+study+gui'. This URL is presented within the document body, disguised as a study guide. The file also exhibits a PDF link farm heuristic, indicating a large number of outbound links, many of which point to the 'static.usrfiles.com' domain. The primary malicious IOC is the redirector URL, which is likely used to deliver a secondary payload or phish for credentials.

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.club/wix?keyword=modern+chemistry+chapter+1+study+gui
    • https://static.usrfiles.com/ugd/b58d21_4c34dee5b9254524a1615a66e1e8afb7.pdf
    • https://static.usrfiles.com/ugd/c1de29_e1c141415ad34d22b6f99a4647adc064.pdf
    • https://static.usrfiles.com/ugd/b8c837_d67b4c963fb44659a47360a24d2ee498.pdf
    • https://static.usrfiles.com/ugd/d01287_6dd77f5c19e748338ff0c1c5d3d35575.pdf
    • https://static.usrfiles.com/ugd/b8c837_50f6211c317440199d0a1933d8024b7f.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/conan_exiles_yoggite_mask.pdf
    • https://cdn.shopify.com/s/files/1/0433/5714/3199/files/lexozisamowomibazenaf.pdf
    • https://cdn.shopify.com/s/files/1/0438/4253/5581/files/68542572476.pdf
    • https://cdn.shopify.com/s/files/1/0465/3803/1254/files/68079926635.pdf
    • https://cdn.shopify.com/s/files/1/0432/3681/9104/files/71931175183.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7638/files/53693845593.pdf
    • https://cdn.shopify.com/s/files/1/0432/7813/9556/files/august_2020_calendar_with_holidays.pdf
    • https://static.usrfiles.com/ugd/74c34a_af1867d2ae7c4851b4fad0e903b2d7b4.pdf
    • https://static.usrfiles.com/ugd/0ad6c7_04a811a02698470ca25ebd510f4cc9b4.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_off000074fa.bin
c3c0c525990834754d5ed41a705bfaf9fd78e23f4153430fd07f0918bb8c2e89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FA 5612 bytes
font_01_sfnt_off000087f6.bin
7a69fe757bf5f4606da052504dfbf78dfe71c46b61cebc0902adcd417a9ad90d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87F6 10288 bytes

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