Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48e514142ad5c62…

MALICIOUS

PDF

46.1 KB Created: 2020-08-31 08:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a48fde42ad0a0aedf8b4f2896147bef SHA-1: 6ab65f674d6d602e2737d53c0fedacfcf5e3a8e1 SHA-256: f48e514142ad5c62ce8dfcfc863d6e49066704798c04fd50b55a844b123ef95a
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to static.usrfiles.com, but one critical link directs to ttraff.com, a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a worksheet answer key, which is likely a lure. The primary attack pattern involves tricking the user into clicking the malicious link under the guise of accessing educational material.

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.com/wix?keyword=periodic+trends+worksheet+answer+key
    • https://static.usrfiles.com/ugd/097bd5_c4a95d034faa4574bd1a06a219890e65.pdf
    • https://static.usrfiles.com/ugd/a18aa6_a4102fd8ac4f4211a0a1b0c190e0de34.pdf
    • https://static.usrfiles.com/ugd/c0fca2_e8bcab74e10a49d8af1f0327fdf1db82.pdf
    • https://static.usrfiles.com/ugd/9757e7_adecb53ac82f47568e3e6131f027df7e.pdf
    • https://static.usrfiles.com/ugd/5360f8_5b175595dbb84780a2fb2d3eeb4c1581.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b258fa5bdb14960bd08c7cdd2eca49a.pdf
    • https://static.usrfiles.com/ugd/b8c837_9dae9b710cb74eef81b00a83a76f1166.pdf
    • https://static.usrfiles.com/ugd/b8c837_005882a4fa324a5691640cd1ef84b234.pdf
    • https://static.usrfiles.com/ugd/b8c837_89ca5d07582545b3a6e3f7cf3843dbbc.pdf
    • https://static.usrfiles.com/ugd/48f461_2d63f2fd7c424276a809ae9bdc2a5851.pdf
    • https://static.usrfiles.com/ugd/b8c837_b699bc79bc6a4b26a95dcaf6efec5f35.pdf
    • https://cdn.shopify.com/s/files/1/0434/5528/3366/files/kazowubifodulib.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/63377235315.pdf
    • https://cdn.shopify.com/s/files/1/0460/3717/2383/files/5012275613.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/11144572984.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_off00005f7f.bin
a6cca37967ad7eef2e06ad1464a1a5d8977103d694740fc83d960884b45daa38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7F 5040 bytes
font_01_sfnt_off000070a6.bin
e330331e2199290ff3379310233024a24194135e60604c2f861b49d3f440086e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A6 14620 bytes
font_02_sfnt_off00009d66.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D66 4324 bytes

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