Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d1905f8508c243…

MALICIOUS

PDF

42.0 KB Created: 2020-09-07 18:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72298c2047f2a0c691cefffbbe8bd7af SHA-1: 3445992a4d7ec9519a772590eb6bc22191c58aeb SHA-256: 93d1905f8508c243415c6a66b85c46e1459a500a52d478b085cc91b8dc8116a7
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one heuristic specifically identifying a link to a known malicious redirector. The document body, though heavily corrupted, contains text that appears to be a lure for educational material. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further 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.me/pify?keyword=bbc+english+book+class+11
    • https://static.usrfiles.com/ugd/4f92c1_c27738ad89064e229ee73c862a33172e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a2f1bb028824d18b235d7011b930a57.pdf
    • https://static.usrfiles.com/ugd/078c79_9e3f5c495e154fd6bf4023ef115ecada.pdf
    • https://static.usrfiles.com/ugd/565485_c38002fa0693466c98485683fc1a1bae.pdf
    • https://static.usrfiles.com/ugd/fbcb80_6110d9dd895e471db074dc4cce43ac3c.pdf
    • https://cdn.shopify.com/s/files/1/0431/6017/4754/files/gawegulazuvojuxilezi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5024/6039/files/gakimezawetenivi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1002/files/vawalumaxovemipapibage.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/southwest_rapid_rewards_number_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/5425/9606/files/10613513818.pdf
    • https://cdn.shopify.com/s/files/1/0434/1848/4885/files/6719649656.pdf
    • https://cdn.shopify.com/s/files/1/0440/6345/7432/files/21104845415.pdf
    • https://cdn.shopify.com/s/files/1/0429/8797/8913/files/60776703756.pdf
    • https://cdn.shopify.com/s/files/1/0437/2394/8183/files/app_avg_antivirus_pro_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/rirobomikatikilosaxezatel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ae3.bin
90b9048db4e56be3a13931bb1acc1df1ab9cd114cb570a87d24d7a5174ea5d19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AE3 5268 bytes
font_01_sfnt_off00005cd8.bin
f33f4eaeb7a622ad3307eb30f5f30c9f90ed328f1bfe65896cb1249a2c083ce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD8 13252 bytes
font_02_sfnt_off000085e6.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85E6 16164 bytes

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