Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1c1de075fbfe0e…

MALICIOUS

PDF

47.6 KB Created: 2020-08-31 20:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b1623e61836003602d28df51f0f75fb SHA-1: b8de7f978db29f2c328ececbbd907e016f980b5b SHA-256: 1c1c1de075fbfe0e5433df0f7fe4b2932bac09000f6f1cbb802b8893c705b6f6
120 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=grading+sheet+for+teachers', suggesting a lure to trick users into clicking on a malicious link. The presence of numerous other PDF links further indicates a link farm strategy, likely for SEO poisoning or to distribute malware.

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=grading+sheet+for+teachers
    • https://static.usrfiles.com/ugd/8ba634_0a50e10461784dedacd4db7e5a9abd7f.pdf
    • https://static.usrfiles.com/ugd/3e87bf_c394aa402db4494598d568338b655717.pdf
    • https://static.usrfiles.com/ugd/19ce5d_4b83808250b54ef6b8bda38fa7509827.pdf
    • https://static.usrfiles.com/ugd/76156b_694e63c921fb4bcf9065d006d1171743.pdf
    • https://static.usrfiles.com/ugd/79e0dc_8294a6d252054e3ca0bee40e332ed774.pdf
    • https://cdn.shopify.com/s/files/1/0438/1114/3842/files/8506583262.pdf
    • https://cdn.shopify.com/s/files/1/0430/3772/0733/files/25729399106.pdf
    • https://static.usrfiles.com/ugd/b8c837_4dd701a1a1a34f57acba642faf80095b.pdf
    • https://static.usrfiles.com/ugd/b910ae_269aca2b939a46459d0339cb183e56a4.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_9fa58e3bfa5f45a38e6bd3c60695e948.pdf
    • https://static.usrfiles.com/ugd/19103d_87efcc4d1f91403c8d3940944005304f.pdf
    • https://static.usrfiles.com/ugd/09c3c7_c44e24c1cd2f402eb8aee0f10e9a5ac4.pdf
    • https://static.usrfiles.com/ugd/b8c837_9616aa18dc914bb6bb01111b6d486959.pdf
    • https://static.usrfiles.com/ugd/234f58_3e370605dec54c2ba2b3c53781f7d1fb.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074c0.bin
bd050531d148fabdc3eaf0cdcc89a0a4220c97d6c76b539fd843183b43707bd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C0 5284 bytes
font_01_sfnt_off000086b9.bin
7162765c0e12dfaf74c25f6b8fcf697dbe5e82053012cb2e989e6f68347507e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86B9 13576 bytes

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