Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13d989cbdfcd41f…

MALICIOUS

PDF

44.3 KB Created: 2020-08-31 00:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65f4ca85597384939eff7de817fbecaa SHA-1: 2d237b59c1edfd0ea6d8d6d5757dfdca689857e7 SHA-256: b13d989cbdfcd41f0a83b27aedfe2491d5f463da4c5e5fb1e185c0f5af3788e0
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 a redirector service. The document body text, though heavily obfuscated, contains a URL that appears to be a lure for educational content, specifically "Glencoe osmosis virtual lab answers". This suggests a phishing or social engineering attack aimed at directing users to malicious infrastructure.

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.ru/wix?keyword=glencoe+osmosis+virtual+lab+answers
    • https://static.usrfiles.com/ugd/22bf55_cca4d0e429e24e87b3f5249d4343b833.pdf
    • https://static.usrfiles.com/ugd/628a76_67437fdfaae0464299157551a734c544.pdf
    • https://static.usrfiles.com/ugd/b8c837_3266973cf40d4bb08be5c98beabdb23c.pdf
    • https://static.usrfiles.com/ugd/ec0c41_b5dacbe4a948426eb758622785ff2a66.pdf
    • https://static.usrfiles.com/ugd/74a852_9cdc680812be4d2abf4272dd963c4a51.pdf
    • https://static.usrfiles.com/ugd/de3d83_18499973ffae4a3783f9c1a10d77b758.pdf
    • https://static.usrfiles.com/ugd/b8c837_56d54847a64f4655a2ec39c63baa34b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d82a05f57f14d5c905d6675c8c72b8f.pdf
    • https://static.usrfiles.com/ugd/6f9b04_88d48486e54a43c2a670473a455e917f.pdf
    • https://static.usrfiles.com/ugd/a298ce_694ad195a67747caa1d5c860c35fabb0.pdf
    • https://static.usrfiles.com/ugd/3aee12_c84b83804f1a40d7a861a6649398192a.pdf
    • https://static.usrfiles.com/ugd/b8c837_e285629aa57b4869b8e57c127a89b030.pdf
    • https://static.usrfiles.com/ugd/b7ab08_ebffb786bc1f44849caa5397f77b1329.pdf
    • https://static.usrfiles.com/ugd/e8506d_0c2c8a15684249ccaa8aeb395e4b9b8c.pdf
    • https://static.usrfiles.com/ugd/361045_746f7c4e362b4f07a00044ca8dda5bb3.pdf
    • https://static.usrfiles.com/ugd/b8c837_6bde1bf4d48645b9821b20ead62ea58b.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_off00005957.bin
fe03b48e5f98da5eb302ca89fd27fe354833c76e817ab0f2d89f35f792e48a37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5957 5152 bytes
font_01_sfnt_off00006ad1.bin
0ffba809ec3e1b86a2549e071d60c8770d02dcbc703166658d5f055a020e036e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD1 13452 bytes
font_02_sfnt_off00009597.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9597 4324 bytes

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