Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c50a283c5e49f6c…

MALICIOUS

PDF

93.7 KB Created: 2020-08-02 14:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 944162b3d008eaf5c9455d6c7c4a6e24 SHA-1: 6bbaaa3323171d5932d4938b5725c5bc193b9772 SHA-256: 6c50a283c5e49f6cb6d05f6c980f9756d070891d081791936bd0b28df4e6cf9a
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links to other PDFs, a technique often used for SEO link farming. Additionally, it includes a link to a known malicious redirector, suggesting a malicious intent to lead users to harmful content. The ML classifier strongly flagged this PDF as malicious.

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=how+to+edit+tf2+hats
    • http://files.minilivestock.com/uploads/1/3/2/7/132740415/38a223c.pdf
    • http://files.fastlanenitrous.com/uploads/1/3/1/1/131164479/9187223.pdf
    • http://files.misssandyssandbox.com/uploads/1/3/1/6/131606861/tixuxew-zimulujedev-worav.pdf
    • http://files.schoolhouseyogastudio.com/uploads/1/3/0/9/130969489/6244032.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7495/3120/files/26400318253.pdf
    • https://cdn.shopify.com/s/files/1/0434/6970/1280/files/motixutotutebasafuli.pdf
    • https://cdn.shopify.com/s/files/1/0437/1893/4677/files/70640296639.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30553092986.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/muvovuxineromilavipopibab.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/dudazo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/pidax.pdf
    • https://cdn.shopify.com/s/files/1/0429/5131/1513/files/posudipixalevezogujere.pdf
    • https://cdn.shopify.com/s/files/1/0436/3524/5216/files/vanabawitikamodifabivilu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/28105612008.pdf
    • https://cdn.shopify.com/s/files/1/0430/7143/9001/files/17997651012.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a1d.bin
8ba03b0339b65b1b1bc6f8c5247a9d1b02c50ed8a72abac5138c61c929b8f609
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1D 5052 bytes
font_01_sfnt_off00013b5f.bin
549dcbcf4d7d7bebc31e6feca909560b74a7b5acab6d88e2d5c734bfd5eb8bbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5F 14864 bytes