Malicious PDF — malware analysis report

Static analysis result for SHA-256 283f5527836e7d85…

MALICIOUS

PDF

37.5 KB Created: 2020-08-29 23:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f76bf38d60b454b034979105be95598 SHA-1: c70742b2ea9b88116bb98b550f6321453a71a491 SHA-256: 283f5527836e7d85d201362988bcbf1f3c52abdb46e094f7691eb6f93a1e5680
128 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to an 'answer key' and includes the malicious URL, suggesting a social engineering lure. The presence of a 'download button' heuristic further supports the malicious intent of directing the user to external content.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=signing+naturally+answer+key
    • https://cdn.shopify.com/s/files/1/0441/3833/2312/files/kajufar.pdf
    • https://cdn.shopify.com/s/files/1/0435/6990/5825/files/hijri_calendar_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/5517/7109/files/93127814803.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_af1ecabe651b4574b6e1956922ec01c0.pdf
    • https://static.usrfiles.com/ugd/cd79e3_111284eac76242bc998a88c40b8dcaae.pdf
    • https://static.usrfiles.com/ugd/b8c837_953e6decbe2a445cbfe6efe51b00db57.pdf
    • https://static.usrfiles.com/ugd/b8c837_7aac972cb21d457d8e47059fe76460f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_449531be947f4abbbab4ac6ba5463b66.pdf
    • https://static.usrfiles.com/ugd/b8c837_255247082a2043cfad4a63756a91029a.pdf
    • https://static.usrfiles.com/ugd/b8c837_db0f21ed758f4bd0b9a393ee819e4285.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc25af426ad04839a74d89c065067bb3.pdf
    • https://static.usrfiles.com/ugd/b8c837_8bda8bdaa3984470a4fde9f2de22f781.pdf
    • https://static.usrfiles.com/ugd/63d3ad_623b8ba2c13648b7baff6cffc22deb51.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_off0000468f.bin
2c0ae5f47837ed88d14af5c823f51ace07568e7b891c4a4a6fee691694e2dd68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x468F 4988 bytes
font_01_sfnt_off0000579e.bin
6347db20e89848ce072290c5a089a4b35296f5f7aa31d9a0dff22dfeb199f42b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x579E 10436 bytes
font_02_sfnt_off00007b52.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B52 4324 bytes

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