Malicious PDF — malware analysis report

Static analysis result for SHA-256 3899eb4a3d665f24…

MALICIOUS

PDF

43.4 KB Created: 2020-08-05 12:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6c3f2f38ad5ca7f1665b98ccfc60cd7 SHA-1: 72a1113ae7d72e274a6a8fef22e6474565ce4e1f SHA-256: 3899eb4a3d665f24fa7fb7742451bd81ca11586edf58fe82a4623fdf669f1e72
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links pointing to other PDF files hosted across various domains, indicating a link farm. One of these links, https://ttraff.cc/pify?keyword=acuerdos+de+basilea+2+pdf, is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body is heavily obfuscated and contains what appears to be a reference to the malicious URL, suggesting the primary purpose is to direct users to malicious infrastructure.

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=acuerdos+de+basilea+2+pdf
    • http://files.pinegrovecogop.org/uploads/1/3/0/8/130874318/de351d21ce3806f.pdf
    • http://files.arlotrainor.com/uploads/1/3/0/8/130813373/guzexumuloniruw-jogumoba.pdf
    • http://files.viviankeenan.com/uploads/1/3/2/7/132740413/e98f1.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97897646990.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/25292477607.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/kedolipegamekusidojibubo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2063/9646/files/xegozazujafalanufesaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7527/2855/files/kiruxizegodameremi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3234/4736/files/53794978893.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68876684382.pdf
    • https://cdn.shopify.com/s/files/1/0437/9390/7869/files/2678875421.pdf
    • https://cdn.shopify.com/s/files/1/0440/7679/4021/files/dajidonat.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/71439384098.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tokon.pdf
    • https://cdn.shopify.com/s/files/1/0428/7044/0095/files/77063508075.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_off00005e27.bin
559b92688d0e524db017ac6baceecd4a23dfcaf4b64516650d0e2294214bf909		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E27 5104 bytes
font_01_sfnt_off00006f88.bin
b78fb98da26449dd73b30de29edc4c92f5a165749ffa3308be952ea5bd3cd315		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F88 10440 bytes
font_02_sfnt_off00009191.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9191 4324 bytes

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