Malicious PDF — malware analysis report

Static analysis result for SHA-256 548a5c3f31ec377b…

MALICIOUS

PDF

42.5 KB Created: 2020-08-08 04:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e489cf34c3bf969d6be776e891704ac6 SHA-1: 8c013ec4c57399a8a44ba285819d8a5f7a9afc77 SHA-256: 548a5c3f31ec377b22504c3d61433d8d8bde9c19eb9908091d9daa494143e140
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that appears to be part of a link farm, likely intended to lure users to malicious sites through SEO poisoning tactics. The presence of numerous external links, many hosted on Shopify, suggests an attempt to distribute malicious content or phishing pages.

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=tratamiento+rinitis+alergica+pdf
    • http://files.pendleventures.com/uploads/1/3/2/7/132740892/rozifanefu.pdf
    • http://jimuwave.bromswoldbikefest.org/uploads/1/3/1/4/131453194/6dcdb99.pdf
    • http://files.localproduceguide.com.au/uploads/1/3/0/7/130775046/8352834.pdf
    • http://bemopis.openrangecandy.com/uploads/1/3/0/7/130776791/jurefuxepunewegabej.pdf
    • http://files.studio339.net/uploads/1/3/0/7/130776031/7708096.pdf
    • https://cdn.shopify.com/s/files/1/0435/2186/7930/files/gifamupibide.pdf
    • https://cdn.shopify.com/s/files/1/0437/7994/8695/files/11th_science_biology_book_in_gujarati_2020_ncert.pdf
    • https://cdn.shopify.com/s/files/1/0433/4839/4142/files/76878993471.pdf
    • https://cdn.shopify.com/s/files/1/0448/2121/7442/files/punjab_govt_benevolent_fund_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0448/0407/9777/files/o_messias_vem_a_terra_media.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/xetujexataliguwuxolejodo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1307/8168/files/nigemofezamu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/cell_organelles_crossword_puzzle.pdf
    • https://cdn.shopify.com/s/files/1/0434/8434/8569/files/72365837208.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/66352599033.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/free_newsletter_templates.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_off0000670b.bin
3eca7e5a0097494e55f7b89dd78ef5d04761df4798a33f29a00e300268f0b181		 pdf-font-stream PDF embedded font (sfnt) at offset 0x670B 5424 bytes
font_01_sfnt_off00007967.bin
68134f220da353e9927055e75c56f6d47388c0bf14a2497060732c6f231412b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7967 10508 bytes

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