Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d7e92c909503b5…

MALICIOUS

PDF

57.1 KB Created: 2020-07-30 22:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28e8e1469d7b932ea0a0856a9f26eb6c SHA-1: 7de44193072065d0938f209101da96b4d8dead77 SHA-256: f9d7e92c909503b5c49aa6b31882833c8799316e26c6c68519d46f37f9241134
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high number of embedded links, with the primary link pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a deliberate attempt to distribute malicious content or phish users. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the document structure and embedded URLs suggest a delivery mechanism for further 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://ttraff.cc/pify?keyword=banking+chronicle+pdf+january+2020
    • http://files.hotelselloffs.ca/uploads/1/3/1/4/131453843/9846732.pdf
    • http://files.wattssashiko.com/uploads/1/3/0/8/130874493/2505733.pdf
    • http://files.thesoundingboardteachingministries.com/uploads/1/3/0/8/130813860/84c36a7.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93616534700.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6557/files/87829544248.pdf
    • https://cdn.shopify.com/s/files/1/0432/4573/2007/files/21717707875.pdf
    • https://cdn.shopify.com/s/files/1/0435/4703/3752/files/guzepamukopixakuzeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/kizuxiru.pdf
    • https://cdn.shopify.com/s/files/1/0432/8908/4068/files/66502732748.pdf
    • https://cdn.shopify.com/s/files/1/0434/9103/3250/files/28094446483.pdf
    • https://cdn.shopify.com/s/files/1/0437/2814/2501/files/51835604607.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/79298702806.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/legujamojilevomixufoni.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/zesagowagiledosinov.pdf
    • https://cdn.shopify.com/s/files/1/0436/4750/0448/files/pizax.pdf
    • https://cdn.shopify.com/s/files/1/0429/3325/6345/files/xakerawi.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_off00009e01.bin
57169fac98bf4c8ded709951a02e9c56272d126284f2adffec86bdf24297eeb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E01 5608 bytes
font_01_sfnt_off0000b10a.bin
1696f7b8db2b184d87e39b8e015766e71aa0a57b6fc1f7137b496c75c994f492
pdf-font-stream PDF embedded font (sfnt) at offset 0xB10A 11120 bytes