Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf293313595b0fc…

MALICIOUS

PDF

50.3 KB Created: 2020-08-10 20:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8047bc3b92c52bec5fb61f2994b5d88 SHA-1: 26d2b58c03e89ea0865a85a326f0aa5a4e282e7b SHA-256: 6cf293313595b0fc4129e2b35d8d97450486f74e261fcdb68d90f6396e58da6b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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.ru/pify?keyword=viaje+alrededor+de+la+luna+julio+verne+pdf
    • http://files.harrydwyerphotography.com/uploads/1/3/0/8/130873708/lonogejojoniganado.pdf
    • http://files.roguecosmetique.shop/uploads/1/3/2/7/132741194/divowaje.pdf
    • http://files.paulpsychicmedium.com/uploads/1/3/0/7/130739315/dff96.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/6063/3504/files/20164377480.pdf
    • https://cdn.shopify.com/s/files/1/0432/4042/3592/files/table_e_multiplication.pdf
    • https://cdn.shopify.com/s/files/1/0430/6491/8165/files/fegitatujorudovefoxeler.pdf
    • https://cdn.shopify.com/s/files/1/0431/5404/7137/files/1265996123.pdf
    • https://cdn.shopify.com/s/files/1/0431/6119/0554/files/ayia_napa_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4870/files/how_to_cite_file_from_website.pdf
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/vitezopinorolirodi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3142/files/47086176682.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/33374560870.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/bulonunazuxeros.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/ratenebulubo.pdf
    • https://cdn.shopify.com/s/files/1/0453/4956/8667/files/atoms_and_molecules_class_9_ncert_notes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078af.bin
a0a690a65b4c20e8443f0ca685fbad3d7b8d46df8506eeed9a69b7b6e709cc00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78AF 4760 bytes
font_01_sfnt_off000088ed.bin
4c2ef93e602c16c55ed063ef38bb1b3c982273304977fce306d7cc51b3885e44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88ED 10820 bytes
font_02_sfnt_off0000ac5c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5C 4324 bytes

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