Malicious PDF — malware analysis report

Static analysis result for SHA-256 907bd8a4fe8c599b…

MALICIOUS

PDF

45.4 KB Created: 2020-04-01 17:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 77460e7478f7a628cb3400f8c788ac40 SHA-1: ce4a7f965f45614614bcca7e0026a929933a903e SHA-256: 907bd8a4fe8c599b351d991249e9b452999287e7f1383fc936904ed69bf4e1a7
62 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique commonly used for SEO poisoning and distributing malicious content. The document body, though partially corrupted, suggests a lure for a free textbook download, which is a common social engineering tactic. The primary heuristic identified this as a PDF link farm, indicating the document's purpose is to redirect users to numerous other potentially harmful sites.

Heuristics 3

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://christophercameronstudios.com/uploads/1/3/1/3/131398006/131398006.html#conceptual+chemistry+5th+edition+pdf+free+download
    • http://munchandchug.com/uploads/1/3/0/6/130604700/vaxavupatu-rozonokosataxiz-sumanone.pdf
    • http://eastdhuriver.com/uploads/1/3/0/7/130739824/sumev.pdf
    • http://comfikitchen.com/uploads/1/3/0/4/130435857/6310765.pdf
    • http://sysadmindojo.com/uploads/1/3/0/6/130604250/sobelariga-durixotemuf-vomozivudamu.pdf
    • http://csbeer.org/uploads/1/3/0/2/130289651/wujuseginujefiva.pdf
    • http://keynoteadmin.net/uploads/1/3/0/5/130590770/podopozugez.pdf
    • http://westernjules.com/uploads/1/3/0/5/130542912/wifiximamuzipexe.pdf
    • http://bookkeepingbycindy.com/uploads/1/3/0/7/130775310/pikufafote.pdf
    • http://charlesberg.org/uploads/1/3/0/4/130483402/bbc14f51be4.pdf
    • http://ssilvaadvogados.com/uploads/1/3/0/7/130776737/tiwivipapajomufure.pdf
    • http://lowcountryclay.com/uploads/1/3/0/4/130488331/kaxopanar.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_off00006962.bin
df6de5661a106c5a69f43b0f24e3ca4f9afc68c2033168b8cd1adb26ee70f8ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6962 8196 bytes
font_01_sfnt_off000088aa.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88AA 1708 bytes
font_02_sfnt_off00009111.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9111 16036 bytes

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