Malicious PDF — malware analysis report

Static analysis result for SHA-256 defd68acc9e247a4…

MALICIOUS

PDF

66.0 KB Created: 2020-09-17 00:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfa074234f7f38e9c011c013072baaaf SHA-1: 3c8bef8f25cc06d4104c8670600027ab1616a761 SHA-256: defd68acc9e247a4fa34a042a881f89d919dc0e2c73ff651a54a31218f4cd183
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though partially garbled, includes the target URL, suggesting a lure to external content. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which are hosted on Shopify domains, likely to obscure the malicious redirector. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this PDF.

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=unit+2+chapter+2+ap+gov+answers
    • http://jawase.illuminationhealing.com/uploads/1/3/0/7/130738909/1f2c9ec.pdf
    • http://files.shopmiddleground.com/uploads/1/3/1/6/131637014/9825099.pdf
    • http://files.rehobothbeachbalm.com/uploads/1/3/1/3/131383247/guketumuvum.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/23727847429.pdf
    • https://cdn.shopify.com/s/files/1/0437/6195/9063/files/revivosob.pdf
    • https://cdn.shopify.com/s/files/1/0431/2956/9434/files/bakimaduzuguzet.pdf
    • https://cdn.shopify.com/s/files/1/0436/9950/3257/files/54109273142.pdf
    • https://9d55a699-7ea4-4d9b-a9cd-16fa47edb93d.filesusr.com/ugd/8acad3_d5a5bfcda65649e8806ba30aeeb58930.pdf?index=true
    • https://042470b3-82ce-48cb-8bfb-98a5b0537514.filesusr.com/ugd/008e52_64a20e586df345d996ba353d466fb79e.pdf?index=true
    • https://a6933271-3e26-4cef-b40f-ac46484b5ad4.filesusr.com/ugd/e2c6c1_3d2b0771b71a4fc79f5c9f3711b20c8f.pdf?index=true
    • https://b605ce49-3ab7-47a2-90c2-6dba406840d5.filesusr.com/ugd/37987b_5e72e4c6f7bd4c8da8c0c6d8c72bc9bf.pdf?index=true
    • https://46f3f143-ab5b-4536-bf3d-43da5e748356.filesusr.com/ugd/7f614e_de7ac4c96215475aa47df0bb007285d0.pdf?index=true
    • https://13bfea8f-e55c-4602-90a5-b20172c64520.filesusr.com/ugd/735189_56a275c9e2d445c399999f216716c6ca.pdf?index=true
    • https://71b730bd-0a49-44e5-87a7-5fa6dc3fd5b2.filesusr.com/ugd/5c9621_793d54632c28470a87b81280e208673b.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007468.bin
cfd810a5ea282119da4c1abf509a1e6bf8c77e42bfdbea3e308bbcdcc7c40f73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7468 6872 bytes
font_01_sfnt_off000085be.bin
f050eb341d6cdd979119f0808f79588a25bb07c909a7799dff0ba3896bb41996		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85BE 5440 bytes
font_02_sfnt_off0000984f.bin
a2f9b4d509a81df10076f7028f44e5d5efa6c0f3546cfcfa5689ea99552198c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x984F 15080 bytes
font_03_sfnt_off0000bc4d.bin
7905b2fee86817614613e24e7eb480545b50c844fba940a13950e91a34dd798f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4D 10336 bytes
font_04_sfnt_off0000dfd7.bin
ae7cf47c7a33e62192fc5fdc2e4bac5752a168c5f5629dd76e07230528164e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD7 16992 bytes

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