Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ea7c4dce074377…

MALICIOUS

PDF

50.6 KB Created: 2020-08-08 22:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd6639e15abbdf435f51790a6eeb4a26 SHA-1: 574d299bd11387e85df5c7104e993306764d0c65 SHA-256: a2ea7c4dce0743773c9adbd75bf9bddd5515bb1b9a7ae141579a4495dd1a8d78
150 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One critical heuristic identifies a malicious redirector link, suggesting an attempt to lead users to harmful content. The document body, though heavily obfuscated, contains text related to 'learning german grammar pdf' and a URL that appears to be part of this lure. The presence of many Shopify-hosted links, alongside the malicious redirector, indicates a likely attempt to manipulate search engine results or distribute malicious content through a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=learning+german+grammar+pdf
    • http://surefozu.sewsewquilt.com/uploads/1/3/1/4/131482975/wagikon-webupos.pdf
    • http://files.boaianimalcentre.org/uploads/1/3/2/6/132682142/risovuxakokagip-retasomifa-nufenekotowivi.pdf
    • http://files.uncommongoodcollective.org/uploads/1/3/1/0/131070487/cfec9b3e8c0471.pdf
    • http://files.mfolatx.org/uploads/1/3/1/3/131380440/564e35974c.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/56622189891.pdf
    • https://cdn.shopify.com/s/files/1/0437/5130/9473/files/aeschylus_oresteia_meineck.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/38640744518.pdf
    • https://cdn.shopify.com/s/files/1/0434/6806/2872/files/56122383060.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/sumem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0536/9758/files/libro_baradit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/15559480095.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88020392138.pdf
    • https://cdn.shopify.com/s/files/1/0432/9763/6512/files/secret_societies_and_psychological_warfare.pdf
    • https://cdn.shopify.com/s/files/1/0434/6983/2342/files/folen.pdf
    • https://cdn.shopify.com/s/files/1/0431/0758/2106/files/82060790695.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_off00008897.bin
0455e77066c56141cc2fd108536d4f605a2fdb1d8abdd1e230f4a6e2a69a64bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8897 5092 bytes
font_01_sfnt_off000099d9.bin
017bd544ac2c19daf021d55074b1ec4428749e55129750f418e228a843d5d1af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99D9 10540 bytes

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