Malicious PDF — malware analysis report

Static analysis result for SHA-256 147631ce7daad8ad…

MALICIOUS

PDF

39.9 KB Created: 2020-08-05 12:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6979a0081934faa0953e3c6253c5f686 SHA-1: 3aad7763e8b3d595c2cd0c5a6f9422973e93875f SHA-256: 147631ce7daad8addd7c2bccb2fa2b2d16a13c498f8191f979683b9c54cb0afa
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL designed to look like a file converter. The document body, though heavily obfuscated, contains a similar URL. The presence of a mass external PDF link farm further indicates a malicious intent to distribute harmful content.

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.cc/pify?keyword=free+online+file+converter+pdf+to+ppt
    • http://pajeda.pureandsimpletruthforyouth.org/uploads/1/3/1/4/131438641/9279195.pdf
    • http://files.susie-carter.com/uploads/1/3/1/4/131407179/nelinixorepi.pdf
    • http://files.flametreemalawi.com/uploads/1/3/2/7/132710690/rosowi-zasosabama.pdf
    • http://files.openairfarm.com/uploads/1/3/1/8/131857562/parugobi_joxomojewan_talutozaj_vededugufolup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4363/5879/files/jukisezugisatugi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8717/5588/files/16555345337.pdf
    • https://cdn.shopify.com/s/files/1/0434/4345/4102/files/lubisunixavoxufisema.pdf
    • https://cdn.shopify.com/s/files/1/0428/8321/9619/files/31458372546.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/59239787262.pdf
    • https://cdn.shopify.com/s/files/1/0428/7738/6918/files/16969648671.pdf
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/mubowovunepurepagupe.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/95851800176.pdf
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/boruzujotadudifumifixuse.pdf
    • https://cdn.shopify.com/s/files/1/0436/5382/4677/files/8933388121.pdf
    • https://cdn.shopify.com/s/files/1/0437/5491/3950/files/risaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/45299536861.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000609e.bin
1c726f6a033d926ecdecfd613478794c9417f89c334709c796ccb8c20a0a0fa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x609E 4776 bytes
font_01_sfnt_off000070fe.bin
22bd6564356bdba590ae0cb1d1456c3a276a9a3d26b67027b989f4e7b328b92b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70FE 9944 bytes

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