Malicious PDF — malware analysis report

Static analysis result for SHA-256 422315d56c0dabef…

MALICIOUS

PDF

47.9 KB Created: 2020-08-18 17:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c635d8c493b831b04ccbe066210a582 SHA-1: bf778ae0edc6e6905706ff6408ea3fb5cd7a8cce SHA-256: 422315d56c0dabefc4d3b3eeb51361222ae93aa910368ebc9e801cd76e509514
154 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure and for containing a large number of embedded links, characteristic of a link farm. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, including a primary malicious redirector URL and numerous links hosted on cdn.shopify.com and other file-sharing domains, suggesting a delivery mechanism for further malicious content.

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.ru/pify?keyword=bhairava+dweepam+audio+songs++com
    • http://files.dillylily.com/uploads/1/3/0/8/130814288/powipinofawo-tanupomuropekib-pasupi.pdf
    • http://files.solakiancpa.com/uploads/1/3/0/7/130776444/b06345.pdf
    • http://files.phoenixlefae.com/uploads/1/3/0/7/130740141/begaka_loguzisarumivod_vezelukuzil_zazilit.pdf
    • http://files.nicolanotes.com/uploads/1/3/0/8/130813643/gogadut-jivowazajadob-dapanof.pdf
    • http://files.travelblogonline.com/uploads/1/3/1/3/131380600/gabilogizepow_nesebig.pdf
    • https://cdn.shopify.com/s/files/1/0432/9239/3640/files/nibezujisifatejibitomenuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/6432/6299/files/29339701870.pdf
    • https://cdn.shopify.com/s/files/1/0428/6201/8727/files/88258088087.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dosadibevejigavo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9557/2126/files/66402988013.pdf
    • https://cdn.shopify.com/s/files/1/0433/4636/2533/files/wawebovawotevup.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/lizanomexazukogasaret.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0960/files/51797810708.pdf
    • https://cdn.shopify.com/s/files/1/0429/8031/1203/files/47569603311.pdf
    • https://cdn.shopify.com/s/files/1/0430/4502/7993/files/26315901160.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80804151078.pdf
    • https://cdn.shopify.com/s/files/1/0430/6586/8437/files/55835606033.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_off0000732b.bin
42631090884f9befd0ecf32d72bb813e3c4436fdae2ad9244f689abbb7657951		 pdf-font-stream PDF embedded font (sfnt) at offset 0x732B 5656 bytes
font_01_sfnt_off00008660.bin
7d6d7d7d22e44b58ee328fd312b477067d92c569fde3681d5e8f9c0d77e6d592		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8660 14008 bytes

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