Malicious PDF — malware analysis report

Static analysis result for SHA-256 067275b5a3b8873c…

MALICIOUS

PDF

47.0 KB Created: 2020-08-30 14:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77ff6da2843139cd094a117d75ce976c SHA-1: 112c64735aff989a8dd56914a6c0e6882e7ee266 SHA-256: 067275b5a3b8873cc8c819c7367cf19e061df1930ed84df473f4d6811641c386
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector and others pointing to benign files. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or create a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded links and the nature of the heuristics point towards a social engineering or SEO-based attack vector.

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.me/wix?keyword=superman+and+me+sherman+alexie+analy
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/5124/5987/files/english_japanese_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8827/2807/files/teteneduseninafikegotewi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4381/4556/files/que_es_bienestar_psicologico.pdf
    • https://cdn.shopify.com/s/files/1/0427/9956/2911/files/senelifajizesuzowale.pdf
    • https://cdn.shopify.com/s/files/1/0460/1354/6657/files/web_application_architecture_principles_protocols_and_practices_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_fafeba85272149c8a146bdad6c8026ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_afdefb3419d94fc1a92d2b0a2afabdb7.pdf
    • https://static.usrfiles.com/ugd/ae15ca_e6f44e49de9a4618a33d5139e9ab71d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9e377371a5b4457b6a196d957fd3a1a.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e55dd81e7f244cba208efe12f05fd6f.pdf
    • https://static.usrfiles.com/ugd/4826f5_9386268d600f4801812ccb3c72caceff.pdf
    • https://static.usrfiles.com/ugd/1e32c2_109525f16bf94358a049098f72f91898.pdf
    • https://static.usrfiles.com/ugd/b8c837_117b18cd722d45119a8d40e63b306549.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d4c.bin
43464c4ef5efe238b3cb1a23bb217c5d8d08755a282b5c6f4173f1b2640d5a18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4C 5164 bytes
font_01_sfnt_off00007e99.bin
45fdd12cbf882f9f4ea344774e073cc0f4dc73ee5859b902cd89a519b1a7ce1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E99 10092 bytes
font_02_sfnt_off0000a0dd.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0DD 4324 bytes

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