Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b406c7106d50450…

MALICIOUS

PDF

59.4 KB Created: 2020-07-30 08:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20c3a0e32a6bf4f80b24f40fc686b69e SHA-1: 4146c47ca7e755d1589c1c9aaa7240c021422d7f SHA-256: 3b406c7106d50450f0baba717256bc137951d42a38b66c33113748d8107126f0
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it features a large number of external PDF links, a technique often used for SEO manipulation or to distribute further malicious content. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a compromised site.

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=ajax+jquery+json+tutorial+pdf
    • http://files.pilotmissionarybaptistchurch.org/uploads/1/3/1/6/131637150/xodewalapas_vofagozumafodu_pezuxenase.pdf
    • http://files.proyecto1867.com/uploads/1/3/2/6/132683289/buzeguwo-panodelakipiv-kofaderenu-dumonim.pdf
    • http://files.jessicastugelmayer.com/uploads/1/3/1/4/131452803/296902.pdf
    • http://files.iamcarlageorge.com/uploads/1/3/0/7/130738892/5501968.pdf
    • http://files.4614california.com/uploads/1/3/1/0/131071252/govagafapelota_vobegiro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9635/9580/files/44500105055.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/litosobakenopaze.pdf
    • https://cdn.shopify.com/s/files/1/0428/2079/6583/files/pefitotamanebepogivapixa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/gigeroginopimozalo.pdf
    • https://cdn.shopify.com/s/files/1/0439/1878/6728/files/wivowuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/3849/8206/files/wufilog.pdf
    • https://cdn.shopify.com/s/files/1/0434/9453/9429/files/tibojilexivapudugavudosox.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/bovaxado.pdf
    • https://cdn.shopify.com/s/files/1/0432/0280/5917/files/67176293042.pdf
    • https://cdn.shopify.com/s/files/1/0433/8178/4734/files/sesubijikariwadeguro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mavadusuwavofemikedoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28821374719.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/67756375754.pdf
    • https://cdn.shopify.com/s/files/1/0435/6587/5359/files/64738494980.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009d8d.bin
351bdbbbe29992acc9c4ac5a0375b0e537335c9097e8dda2cf7a7049b6d1fba5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D8D 5280 bytes
font_01_sfnt_off0000afa7.bin
c569d9f7aa2021f76233d08d77e786b9bd50d04d273265a2e194b410e59afe61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA7 15772 bytes

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