Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2a5a07df270fe5…

MALICIOUS

PDF

46.2 KB Created: 2020-08-03 01:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32cfda3d76c3da5c163d927de4fb653c SHA-1: b771a1d2b8cd0d83c6f698cb9a1db6f37465936c SHA-256: 5f2a5a07df270fe57f5ad316d5abd6c6b7d38a46eea9c9c320090937190e1ca3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF file contains numerous embedded links, many pointing to what appears to be a link farm designed to host other PDFs. One prominent URL, 'https://ttraff.ru/pify?keyword=brew+install+iterm2', is flagged as a malicious redirector. The document also contains a lure to copy/paste content into a shell, suggesting an attempt to trick the user into executing commands, likely to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/pify?keyword=brew+install+iterm2
    • http://files.lincolncollegechapelchoir.com/uploads/1/3/1/4/131409526/9547076.pdf
    • http://files.lacuevabearsgolf.com/uploads/1/3/1/3/131381369/8665299.pdf
    • http://files.anewimagesalonanddayspa.com/uploads/1/3/0/8/130874317/5004601.pdf
    • http://files.greyowlinn.com/uploads/1/3/0/8/130874478/eae31a2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4925/4048/files/kumulo.pdf
    • https://cdn.shopify.com/s/files/1/0438/7300/9819/files/ridasivigupisolojukinip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0432/8990/3264/files/sulufu.pdf
    • https://cdn.shopify.com/s/files/1/0440/3019/7910/files/37126848189.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/27655516842.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8913/files/linksys_wrt54g_2_v1.pdf
    • https://cdn.shopify.com/s/files/1/0430/9424/5537/files/zumobosuvuruv.pdf
    • https://cdn.shopify.com/s/files/1/0436/9268/7528/files/42525090815.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0103/files/9374330652.pdf
    • https://cdn.shopify.com/s/files/1/0428/2764/5095/files/terraria_illusive_charm.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000606f.bin
a49a2dc46a7e328512ead04a737f6f409031c4f695ec51d888391d20ee45cec0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606F 5104 bytes
font_01_sfnt_off000071c5.bin
f5c8515b289cc4e7bee7a3325735af20e31b2034a674e2497c1f5d7edea7bce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C5 10728 bytes
font_02_sfnt_off000096b3.bin
d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96B3 16164 bytes

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