Malicious PDF — malware analysis report

Static analysis result for SHA-256 7137c75a4be33f6b…

MALICIOUS

PDF

40.0 KB Created: 2020-08-17 15:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7327c727b7a9565d1a06aa5cf2b90f93 SHA-1: 695c93802828766faef09b60a42552864fbe250d SHA-256: 7137c75a4be33f6b1be4146b583c21c92d7b12c52056c4ac6794ce9b05dfaf4a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially garbled, includes the malicious URL and appears to be a lure related to PDF files, suggesting a link farm or SEO manipulation tactic to distribute malware. The presence of many Shopify links, some marked as benign, alongside the malicious redirector, indicates a potential attempt to blend malicious infrastructure with seemingly legitimate resources.

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=assembler+2+fichiers+pdf+mac
    • http://files.staciezens.org/uploads/1/3/2/6/132696214/6d446ccbfa001e.pdf
    • http://pivaw.sabrinasuazo.com/uploads/1/3/0/7/130776445/69932f57d2aa6.pdf
    • http://jexizupo.joebates.co.uk/uploads/1/3/2/7/132710621/9384817.pdf
    • http://files.carimelane.com/uploads/1/3/2/6/132696104/2087689.pdf
    • http://files.thesecretroombook.com/uploads/1/3/1/3/131398128/jedafo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1358/6600/files/longitudinal_data_analysis_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0437/3279/5541/files/mckenzie_lumbar_extension_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/vajazom.pdf
    • https://cdn.shopify.com/s/files/1/0430/4368/4503/files/curso_de_cabala_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/7116613637.pdf
    • https://cdn.shopify.com/s/files/1/0437/5671/6186/files/latov.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6695/files/75840547138.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4014/files/82683383439.pdf
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/diferena_entre_infeco_bacteriana_e_viral.pdf
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/66814315067.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73881495537.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c94.bin
ee006e24e0ae76e36d423fe0011dc4b1c9f005f96763dbb3a9cfeee87ff275a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C94 5656 bytes
font_01_sfnt_off00006fa0.bin
b04f9dad73f38b41f139d41c22733e7f37fc066e51f0add84a6b87aa7e387d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA0 10688 bytes

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