Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bbc2c960f57151…

MALICIOUS

PDF

40.0 KB Created: 2020-08-27 13:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c3fd224cc84f18e900747570b753d43 SHA-1: ea4173ac91bf95141194a5a8bb5b349a5441bdad SHA-256: 92bbc2c960f57151f14e12f5ae8d07d71ab2d4e814cfa6f01dc86b555b11ea5b
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that is designed to lure users into downloading a tool. The document body and heuristics indicate that the primary purpose is to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=samsung+300k+tool+download+windows+7
    • http://dedilejo.stpaullevittown.org/uploads/1/3/2/3/132303354/juxekajebase_xejek_fimogijezum.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/rokoxub.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/kaeser_sm11_compressor_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/0737/7567/files/libros_apologetica_cristiana.pdf
    • https://cdn.shopify.com/s/files/1/0431/2737/3981/files/kolokuzasuwexoli.pdf
    • https://cdn.shopify.com/s/files/1/0436/7423/9129/files/cheggs_return_label.pdf
    • https://cdn.shopify.com/s/files/1/0437/2742/1608/files/benim_hocam_matematik_dgs.pdf
    • https://cdn.shopify.com/s/files/1/0435/1003/8683/files/67655520518.pdf
    • https://cdn.shopify.com/s/files/1/0433/9597/3276/files/sutowomuzamu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6075/6641/files/80437825269.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9432/files/negimokezowapu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8135/8759/files/79405803038.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/zuxudafaxan.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/diabetic_peripheral_angiopathy.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_off00005dd7.bin
40b6cfeeca3865aae8a2de5fbcccd404ca4ce09f550a165569c490dbc8c3c336
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD7 5692 bytes
font_01_sfnt_off00007140.bin
95684b779a97d4ee1e5a2307b4ee273c01d2423abff4af8b6ad3d22c325abb6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7140 9968 bytes