Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b38d1ea2fd794ec…

MALICIOUS

PDF

40.9 KB Created: 2020-08-30 22:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bac12647fbb4621be9093ba7d40d7fcd SHA-1: 4da3466ba068a47c77340e33d0a577e48ee0bb13 SHA-256: 7b38d1ea2fd794ecf855ab47b791e193c576242d7227600badb924a1783abcf6
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a high number of embedded links. One of these links, found in the document body and also listed as a critical heuristic firing, points to a known malicious redirector. The document appears to be a lure for free book downloads, but the embedded links lead to malicious infrastructure.

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.com/wix?keyword=libros+de+yiye+avila+gratis
    • https://cdn.shopify.com/s/files/1/0431/5804/4826/files/45524522577.pdf
    • https://cdn.shopify.com/s/files/1/0431/0928/6050/files/world_war_2_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57917948996.pdf
    • https://cdn.shopify.com/s/files/1/0437/1880/3610/files/tikenesavomasapixije.pdf
    • https://cdn.shopify.com/s/files/1/0430/4125/9671/files/cry_freedom_oxford_bookworms_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/8518/5702/files/camscanner_license_apk_2019_1._7.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/irs_form_9423.pdf
    • https://cdn.shopify.com/s/files/1/0435/3874/3450/files/ach_authorization_form_example.pdf
    • https://cdn.shopify.com/s/files/1/0429/2031/2991/files/98647286740.pdf
    • https://cdn.shopify.com/s/files/1/0451/0469/3400/files/non_verbal_communication_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0455/files/6696625870.pdf
    • https://cdn.shopify.com/s/files/1/0428/1961/6935/files/90951070255.pdf
    • https://cdn.shopify.com/s/files/1/0431/7590/3383/files/calcaneal_bursitis_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0436/5962/4606/files/96235910218.pdf
    • https://static.usrfiles.com/ugd/b8c837_15e92f99d0184713afe8be59e0e5d453.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad3664f75d21438c9aca8596a88ec93b.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_off00005f64.bin
2be68f535b16e40d5c74ed2a4a1f88cc3dc3f8d00619ce8a026697154ec5cbe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F64 5236 bytes
font_01_sfnt_off00007147.bin
85890132bc052762edfd65391e1862c013ec885b0da822dcae19ac2e79efb354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7147 11128 bytes

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