Malicious PDF — malware analysis report

Static analysis result for SHA-256 294c618f45b51d20…

MALICIOUS

PDF

34.6 KB Created: 2020-08-22 11:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2ce57c96a0059e29671d245434a8ee3 SHA-1: c01c3a55bd3d5f7df9e2a74e498de3dc7dcb7f69 SHA-256: 294c618f45b51d20b3b65f2a87cb6ad5bccf7fddf39c238ce335b0f8e2ed8549
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. The primary malicious URL identified is `https://ttraff.cc/pify?keyword=calendario+octubre+y+noviembre+2018+pdf`. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains references to calendar months and the wkhtmltopdf tool, suggesting a lure document.

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=calendario+octubre+y+noviembre+2018+pdf
    • http://mojabuz.landscapegardenerscamberley.co.uk/uploads/1/3/1/4/131483245/lebajojom.pdf
    • http://tisuzogab.blair-ray.com/uploads/1/3/0/8/130873825/2897778.pdf
    • http://files.kristinfosterphoto.com/uploads/1/3/1/1/131163601/1f575751c082.pdf
    • http://files.madelinedesigns.net/uploads/1/3/0/8/130813135/8495236.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/murmurio_vesicular.pdf
    • https://cdn.shopify.com/s/files/1/0429/8519/3625/files/gajixitutidivedi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7320/0537/files/camera_fv_5_lite_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/3893/1109/files/balai_chand_mukhopadhyay_short_stories.pdf
    • https://cdn.shopify.com/s/files/1/0433/5904/3749/files/71027578956.pdf
    • https://cdn.shopify.com/s/files/1/0435/2763/5096/files/pavinili.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/kuvapopetupegilifupu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gowavofopinesifaremoka.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/detoxezimifibawo.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/72039934221.pdf
    • https://cdn.shopify.com/s/files/1/0436/4120/8992/files/behavioral_neuroscience_breedlove.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/attestation_de_travail_algerie.pdf
    • https://cdn.shopify.com/s/files/1/0431/3897/3857/files/lesuni.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_off000046b5.bin
9957ecfce70400d8353385a2982928a58ebf9c317f26de9c2a5fd0eebf8eda5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46B5 5852 bytes
font_01_sfnt_off00005a9a.bin
594b96d5586a4a3f5bfe17d56e4faa26ca00e3fe6a2b2eec42530009a16b7b94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9A 10032 bytes

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