Malicious PDF — malware analysis report

Static analysis result for SHA-256 485e719a1cbed940…

MALICIOUS

PDF

46.5 KB Created: 2020-08-04 19:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bc2322b5ca9068a22e1218d75fcb404 SHA-1: dc0a69bd542e3ce7c22db2e3bcc0b0b7953a8954 SHA-256: 485e719a1cbed94082fdffb3b7cc52cb60ded6a6c541e7189524451bcb326c8c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a reference to the malicious URL, suggesting a lure to download further content. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=christmas+carol+lyrics+book+pdf
    • http://files.dfalvey.org/uploads/1/3/2/3/132303269/139824.pdf
    • http://files.andersonoverheaddoors.com/uploads/1/3/1/4/131406437/88550dcfd7b6.pdf
    • http://files.44frequencies.com/uploads/1/3/2/6/132681294/c1af5dc.pdf
    • http://files.dfalvey.org/uploads/1/3/2
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/49210943142.pdf
    • https://cdn.shopify.com/s/files/1/0440/8747/6389/files/maxatut.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/vezopelasoxuk.pdf
    • https://cdn.shopify.com/s/files/1/0436/0100/2664/files/gibafugewajagifujiruta.pdf
    • https://cdn.shopify.com/s/files/1/0431/1760/9122/files/18577801364.pdf
    • https://cdn.shopify.com/s/files/1/0432/7545/2569/files/perl_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/2379/3308/files/xusuxupojajogozuzuseduk.pdf
    • https://cdn.shopify.com/s/files/1/0428/8489/0790/files/63400428619.pdf
    • https://cdn.shopify.com/s/files/1/0436/5372/6358/files/56216976901.pdf
    • https://cdn.shopify.com/s/files/1/0435/5247/3252/files/91272328123.pdf
    • https://cdn.shopify.com/s/files/1/0437/9587/3949/files/25331754079.pdf
    • https://cdn.shopify.com/s/files/1/0432/5428/4450/files/73008473230.pdf
    • https://cdn.shopify.com/s/files/1/0432/4383/1464/files/ditorasidop.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_off00006947.bin
dc4538f0a5af1bef0924f892d566e3944fd198f59d50bc7bb69a5bb5dfac1bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6947 5288 bytes
font_01_sfnt_off00007b3d.bin
dcf892bfc224bb73ff8ca8edaa6a9478d3cc67b33e1be4e9171777d92951e59a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3D 10312 bytes
font_02_sfnt_off00009e66.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E66 4324 bytes

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