Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9751336e9d3ce5…

MALICIOUS

PDF

58.4 KB Created: 2020-08-29 02:40:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2aa57733c01775b4c2b7f5be1e1cd11 SHA-1: 8762c2db0f9e029807bd7d158877c75206c6f970 SHA-256: 3c9751336e9d3ce573c4386d1c7aabc3c7a6860997980ceb25ca92e4a4f7c979
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. Additionally, it contains a PDF link farm, suggesting an attempt to obscure the final malicious destination. The primary IOC is the redirector URL, which is likely used to lure victims into a phishing or malware download scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.com/wix?keyword=uchiage+hanabi+shita+kara+miru+ka+yo
    • https://static.usrfiles.com/ugd/b8c837_b832b9a38e744de4ad2ae6d6bb618ed0.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a1bec67214c41a7b49445864f8a60dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_382abbe480fc4d1691a043d002b1885d.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae95686640544d5ca30e516b118348ac.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/singleton_java_android_example.pdf
    • https://cdn.shopify.com/s/files/1/0438/1782/8512/files/andamiaje_cognitivo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65621046881.pdf
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/61764798130.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8801/files/informational_report_investigating_a_career_path.pdf
    • https://static.usrfiles.com/ugd/b8c837_b89691c8310846be9834a7ea135f739c.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc7fd14f55584cf981a041432a1bc95e.pdf
    • https://static.usrfiles.com/ugd/b8c837_34613afffee84039b3d31d112bd4837f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000749b.bin
750c61e66cbb52b35b1863a36359fc359964380792356188a58d1c3ff61155fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x749B 14292 bytes
font_01_sfnt_off0000a34b.bin
4a6c591c52b9fe736a234a35c7657798b5385c95548351f3d113131ed4c90bce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA34B 5480 bytes
font_02_sfnt_off0000b5c2.bin
0b9cfd811e0b7bcbb13ddeb5cbc1f6f6c35541e788f2a15f00d3f618b3ba10f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C2 11204 bytes

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