Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25809c8bd5c6774…

MALICIOUS

PDF

46.0 KB Created: 2020-08-14 06:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 212855a81cb1e44b10845e9eef04280c SHA-1: ed4df0d3e0f10b5792518de06f5668d5a4961a01 SHA-256: c25809c8bd5c67741637dde86ad46d2e49808671134abe269f3fb2966bf30737
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a "low back pain management guidelines pdf" to lure users to a malicious site. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated but contains the primary malicious URL. No scripts were extracted from this sample.

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.com/pify?keyword=low+back+pain+management+guidelines+pdf
    • http://files.abbyflemmer.com/uploads/1/3/1/3/131398231/9140641.pdf
    • http://files.melodywagnerforstate.com/uploads/1/3/2/6/132695321/6140497.pdf
    • http://files.nicolettabarolini.com/uploads/1/3/1/3/131384771/429653.pdf
    • http://files.mrslynchsclass.com/uploads/1/3/1/6/131637606/repax_wagarawisuto_dafofanopenuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/7199/5030/files/61749833484.pdf
    • https://cdn.shopify.com/s/files/1/0437/3646/5559/files/java_paint_program.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/60206491599.pdf
    • https://cdn.shopify.com/s/files/1/0429/7333/1609/files/29641803832.pdf
    • https://cdn.shopify.com/s/files/1/0434/3916/1500/files/the_beguiled_book.pdf
    • https://cdn.shopify.com/s/files/1/0436/3314/8062/files/bullworker_bible_pdf_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3924/files/75646923244.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1688/files/13801214970.pdf
    • https://cdn.shopify.com/s/files/1/0431/0689/3985/files/universal_sign_language_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7728/files/kovudiri.pdf
    • https://cdn.shopify.com/s/files/1/0429/7759/1449/files/tedafu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6509/5845/files/12831716883.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_off0000669b.bin
294740ae865121e120ce303f407d70174d41aa48abdb2743b1583e07887104f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x669B 5496 bytes
font_01_sfnt_off00007949.bin
ee6b272d9ff40b00f6a1300c09d8f94c07c9af0d4c79c6d9f69cf35070a71423		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7949 10224 bytes
font_02_sfnt_off00009c3b.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C3B 4324 bytes

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