Malicious PDF — malware analysis report

Static analysis result for SHA-256 138f461b7097d146…

MALICIOUS

PDF

47.3 KB Created: 2020-08-06 19:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6444517496712e2be6f0f8870b17b884 SHA-1: 65c18195dff53dd798aeb45d3446e8e8202b39af SHA-256: 138f461b7097d1464dae01c9b3baf470413085e46547f234b67b9ec0aace5902
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, https://ttraff.cc/pify?keyword=hannah+arendt+eichmann+em+jerusal%25C3%25A9m+pdf, which is the primary indicator of malicious intent. The document body, though heavily obfuscated, also contains this URL, reinforcing its role in the attack. No scripts were extracted from this sample.

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=hannah+arendt+eichmann+em+jerusal%25C3%25A9m+pdf
    • http://files.iaweworks.org/uploads/1/3/1/3/131381675/rinokanudofowusupevu.pdf
    • http://files.empowerptandwellness.com/uploads/1/3/0/8/130874169/nuvin_bakobalowelex.pdf
    • http://files.newellbooks.com/uploads/1/3/0/8/130813797/vapujulo_rajeker_vewidufe.pdf
    • http://files.food4good.org/uploads/1/3/0/7/130775679/tosagipakin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0763/1783/files/67567684695.pdf
    • https://cdn.shopify.com/s/files/1/0436/2525/0974/files/purified_water_generation_system_design.pdf
    • https://cdn.shopify.com/s/files/1/0429/1756/0473/files/18262412507.pdf
    • https://cdn.shopify.com/s/files/1/0428/3973/6487/files/35000962649.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/nirosekabapoxuril.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/letifelopibed.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/78014739221.pdf
    • https://cdn.shopify.com/s/files/1/0440/8547/7541/files/82908416504.pdf
    • https://cdn.shopify.com/s/files/1/0435/6807/0824/files/sufasurenupo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8363/6644/files/93567088251.pdf
    • https://cdn.shopify.com/s/files/1/0433/3525/4171/files/wevel.pdf
    • https://cdn.shopify.com/s/files/1/0433/4590/3774/files/force_quit_bluetooth_mac.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007664.bin
ad898bb93d81555cc586e7dd7f58a47f003b0c53b272655df7861d1d171c4909		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7664 5576 bytes
font_01_sfnt_off000088ec.bin
692cf9957a5c9a5f590678b8a5a1636ec1120be3c94de79bb0e46851dbe1c458		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88EC 11316 bytes

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