Malicious PDF — malware analysis report

Static analysis result for SHA-256 173c69245294ea0e…

MALICIOUS

PDF

38.2 KB Created: 2020-08-25 22:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16fe3d9525e8be5d992a13389ed842f9 SHA-1: 70c4ee861d11ea3a3cd25867b88daa3210250d44 SHA-256: 173c69245294ea0ecd3639895927d114f1c7d265a42484811070c35c46203a61
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including a critical redirector link to 'ttraff.me', suggesting a malicious redirection attempt. The document body, though heavily corrupted, contains text related to a calendar and URLs, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button heuristic further supports a malicious workflow.

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.
  • 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
  • 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.me/pify?keyword=kerala+kaumudi+malayalam+calendar+2019+pdf
    • http://befulexu.rugratschildcare.com/uploads/1/3/0/7/130776177/zagolasagozuxorovog.pdf
    • http://sixisi.equinecountryusa.com/uploads/1/3/1/3/131384635/bojufowakenezober.pdf
    • http://nekegej.kettlecornnc.com/uploads/1/3/1/0/131070934/zixomid-mozutizamifam-lazudu.pdf
    • http://bereva.smokymountaink9sports.com/uploads/1/3/0/7/130739415/jexugunixeraj.pdf
    • http://ronokemo.santoroc.com/uploads/1/3/0/8/130813042/xuxazowajazirar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102Hussain
    • http://smc.org.inhttp://smc.org.in
    • https://cdn.shopify.com/s/files/1/0432/7355/2040/files/dopifaripufiwusunejerit.pdf
    • https://cdn.shopify.com/s/files/1/0438/9814/2875/files/31021733436.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/finabedefujeti.pdf
    • https://cdn.shopify.com/s/files/1/0440/6679/9766/files/wanolaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8694/6212/files/tivikejipizut.pdf
    • https://cdn.shopify.com/s/files/1/0432/7407/6315/files/chhichhore_movie_hd.pdf
    • https://cdn.shopify.com/s/files/1/0431/9356/5342/files/15234876328.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1658/files/jordan_normal_form_example_3x3.pdf
    • https://cdn.shopify.com/s/files/1/0432/6280/4136/files/57454303953.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
    • https://gitlab.com/smc/meera/blob/master/COPYING

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048eb.bin
d3378b8caab9d877c17f8a2b4bb2ecc73c43e6fbc1f7aa2645360af9f9998117		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48EB 5740 bytes
font_01_sfnt_off00005c68.bin
8ebd478756a0911a3396974e925a46d279bba672f1c3bf4b096b976f612cf88e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C68 3564 bytes
font_02_sfnt_off00006a36.bin
cd18ba7fa76e5cde63626fce2a43027612b7435fcc4603bff58a85af08748266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A36 9724 bytes

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