Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d09bd572b3c2e73…

MALICIOUS

PDF

56.4 KB Created: 2020-09-16 20:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c67657d10b685e7b1f631f7a66d7b741 SHA-1: cfd7139cc7cbf637ae228f97c83af93427d1d09d SHA-256: 4d09bd572b3c2e73d4879982d8b2e2ddc4f555e60f6017cfe60c0d2f91c2c3a2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains embedded links that point to known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found in the heuristics, suggesting the document's primary purpose is to drive traffic to this malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.club/wix?keyword=speed+versus+time+graph+worksheet
    • http://files.airsampler.net/uploads/1/3/0/9/130969429/8714990.pdf
    • http://files.jphono1.com/uploads/1/3/2/3/132302871/vujinokovokavikoreb.pdf
    • http://jugujaviz.princetoncounselingandparentingcenter.com/uploads/1/3/0/8/130814328/74ee2b14b21b8e1.pdf
    • http://files.sumenghung.com/uploads/1/3/2/6/132683142/xirojike.pdf
    • https://71c943b5-f205-42ab-b77b-05c277a7f3c4.filesusr.com/ugd/3225da_e59109502c8e4fe78743368439b87009.pdf?index=true
    • https://99555b4c-f22c-4442-8684-d605425a90e6.filesusr.com/ugd/3ddeef_538fab5ad21d48b08d4b0a77fcd0e212.pdf?index=true
    • https://c47a3bde-6c14-4fd0-a7b5-8612e93f81ed.filesusr.com/ugd/5ea691_119c6d3ec22f41408b652ec57b8d62ac.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/5326/0706/files/mosaxawapofopetufapa.pdf
    • https://cdn.shopify.com/s/files/1/0460/0561/6801/files/automated_answering_service_synonym.pdf
    • https://cdn.shopify.com/s/files/1/0430/7307/7409/files/31591089253.pdf
    • https://d32d31ac-9967-4463-b20d-c17b89a17d55.filesusr.com/ugd/fedf23_b4554b15c23445c8a5fffb2bae38b40e.pdf?index=true
    • https://9db79a1c-4c53-4939-99e0-a3e68795b4a8.filesusr.com/ugd/a58502_23213174d94b4c59857eb6c85bef537c.pdf?index=true
    • https://1df6b9de-a12e-4bf3-a531-b1b922509ff3.filesusr.com/ugd/b5aed9_29fc826e59824b8e9507300a3c5184c9.pdf?index=true
    • 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_off000092cc.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92CC 2828 bytes
font_01_sfnt_off00009cc6.bin
57236370b69a53655e9cabdf2de4e87ea5479defa786229a47aced26b4198085		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CC6 5660 bytes
font_02_sfnt_off0000afec.bin
72642a0f9c27079580c3ec8df40844a8adc18f8e1db7897d2a1ce644806b7cd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEC 10136 bytes

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