Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2543b53a4de1c7…

MALICIOUS

PDF

40.4 KB Created: 2020-10-10 15:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c411300003d0bedb8f878060b9c77a14 SHA-1: d39bd2144ddb94016fa8a1f7b46e79958a55f724 SHA-256: fc2543b53a4de1c7054ff626e14ad94b99d26897a7b10d71106084601c92873c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs are the primary indicators of compromise.

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://ggtraff.ru/pify?keyword=my+time+at+portia+animal+bones In PDF document text
    • http://kekukaga.ajacquesphotography.com/uploads/1/3/1/4/131406412/06faf044.pdfIn PDF document text
    • http://files.alenaephotography.com/uploads/1/3/1/4/131409024/4f4c7c886c6b965.pdfIn PDF document text
    • http://files.thechannelislandgirl.com/uploads/1/3/0/8/130814258/5451647.pdfIn PDF document text
    • http://gofunivaw.mncampbell.com/uploads/1/3/2/7/132741389/vepojazumabusap.pdfIn PDF document text
    • https://site-1038493.mozfiles.com/files/1038493/18668870858.pdfIn PDF document text
    • https://site-1038437.mozfiles.com/files/1038437/mugarukiganumapadixak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3028/0864/files/32601953948.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3565/8906/files/tabela_tipi_2016_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5366/5442/files/fekelim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3495/9256/files/ruralokasexutuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9730/2216/files/gedanirunefuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a25cba57-5309-469d-84b6-a16d50bfd988/12155427658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86d95de-d095-461e-8a96-a6802b0a3042/soruxotised.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C3 5212 bytes
SHA-256: 9e91382c08caf70df5156d633e5582bc2f6e1adc604f958c278e30600e30c645
font_01_sfnt_off00007266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7266 10140 bytes
SHA-256: 1778d161e0a311cb49ee139cc5e145789cb076ec03e290776475003818c3faf2

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