Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbaa50ec1465f91d…

MALICIOUS

PDF

33.1 KB Created: 2020-08-24 19:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1651db3076010de5242683784b0fb85b SHA-1: 64c617748e13f79dac1f305cb3670fa767d12fed SHA-256: fbaa50ec1465f91d4557085ca9de4cfe73f4bf43169900fb51c1d7f7a7d550c1
152 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. Additionally, it contains a large number of external PDF links, characteristic of a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely serves as a gateway to 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.cc/pify?keyword=lagu+bowo+caping+gunung
    • http://files.bethanychicago.org/uploads/1/3/1/3/131383251/b3a45a65401.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/corporate_authorization_form_cra.pdf
    • https://cdn.shopify.com/s/files/1/0432/2807/0052/files/80640873032.pdf
    • https://cdn.shopify.com/s/files/1/0430/6268/9946/files/50174424402.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/11664824823.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/merge_mac_app.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6096/files/wutuj.pdf
    • https://cdn.shopify.com/s/files/1/0465/3980/0734/files/bengali_movie_tumi_je_amar_song.pdf
    • https://cdn.shopify.com/s/files/1/0435/3730/1653/files/89960817917.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2695/files/41851139667.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/35530631699.pdf
    • https://cdn.shopify.com/s/files/1/0431/8189/9944/files/allianz_property_claim_form.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_off0000448e.bin
40705840d07b1d79d3ba9b1e495d86a545eea7c9b432b4072370c4685d541ec1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x448E 4968 bytes
font_01_sfnt_off0000559e.bin
615921df06fa4ae832fe0348c835ba2100cf6122ad85bb56aa2074ddac9706ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x559E 10096 bytes

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