Malicious PDF — malware analysis report

Static analysis result for SHA-256 e177b37c8e2c6526…

MALICIOUS

PDF

36.8 KB Created: 2020-09-14 02:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89e1bd55f1dd3c892e537d6369d7d9c8 SHA-1: 42cadb3b14bb6cb2367549df1584edf823146f23 SHA-256: e177b37c8e2c6526f5d7322d68b096b7d41612c68571704ee8ec86d0c4454a25
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, disguised with a keyword suggesting educational content. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files. The primary malicious IOC is the redirector URL, which is likely used to obscure the ultimate destination of the malicious payload. No scripts were extracted from this sample.

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.link/pify?keyword=g.srt.b.5+worksheet+%25232+answers+page+3
    • http://files.kidscareacademyfmcog.com/uploads/1/3/1/1/131164418/d28eba204.pdf
    • http://files.swirl-studios.com/uploads/1/3/2/6/132682327/pigivipag.pdf
    • http://valopi.jessesclassics.com/uploads/1/3/1/3/131379958/turumu.pdf
    • http://files.mrsnolanskindergarten.com/uploads/1/3/0/8/130874031/guwabatirabo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4204/6103/files/81965317758.pdf
    • https://cdn.shopify.com/s/files/1/0434/1130/8702/files/aireador_de_cesped_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/3810/5000/files/61479836680.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lorabo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7140/5222/files/oblivion_piazzolla_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0431/1305/4359/files/59166666198.pdf
    • https://cdn.shopify.com/s/files/1/0429/7120/1695/files/pijabisetowoliko.pdf
    • https://static.usrfiles.com/ugd/5b9365_17ccded12c174fb48d5dc781be6b0766.pdf
    • https://static.usrfiles.com/ugd/469aea_c3b679f859ba4e0a88c12b6f53614faf.pdf
    • https://static.usrfiles.com/ugd/5438e3_5e0433e3740d4cdaa15ac7cf2e2c39f3.pdf
    • https://static.usrfiles.com/ugd/0049ca_927a1062dae442fb8a03df511da8c9e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c718861d0aa42f28b8f31c7e3617d2f.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_off00004d11.bin
bc84d08018d228d05adea32b76a6c8ffb68eeff73a2ff47e73a86c1bb6d7bd50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D11 5016 bytes
font_01_sfnt_off00005e3e.bin
7997172d3b196227c527d9b1bbb5c1e0e64104e1c4b4d082fe579c7f78f1e884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3E 12840 bytes

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