Malicious PDF — malware analysis report

Static analysis result for SHA-256 04cdb210ffa4e84b…

MALICIOUS

PDF

59.6 KB Created: 2020-08-10 15:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71abf6f06f902553326a07400a23b72c SHA-1: d63ffe882e98051aaf430cad6dcd20a302e3674d SHA-256: 04cdb210ffa4e84b790554df355d99bb12178acbefbe2e8201a4fe2fcff57860
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by the presence of a link farm heuristic. The document body, though heavily obfuscated, contains the same malicious URL. This indicates a phishing attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ssc+synonyms+and+antonyms+book+pdf
    • http://files.realqueers.com/uploads/1/3/1/1/131163736/nagubiwosamedavuxe.pdf
    • http://files.befitnow.co.uk/uploads/1/3/1/1/131163615/notikipi-mirajomal.pdf
    • http://files.wagassociates.com/uploads/1/3/1/4/131406060/wanetisisekagop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/5404/7138/files/49236518831.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/8000/files/48550608032.pdf
    • https://cdn.shopify.com/s/files/1/0430/7746/8327/files/21510017550.pdf
    • https://cdn.shopify.com/s/files/1/0435/5552/0667/files/tifubalotalotire.pdf
    • https://cdn.shopify.com/s/files/1/0439/2307/9323/files/applied_physics_1_first_year_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0431/9523/6509/files/90907725696.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77603652905.pdf
    • https://cdn.shopify.com/s/files/1/0428/0533/0083/files/pugojor.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/construction_company_profile_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0434/6055/9013/files/54224177770.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/how_to_unlock_a_word_document.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_off00009ed4.bin
2a708b1b3d6aeaa72695c778d5f078c7b6d19355385b0e5cc92b55bc568efa39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ED4 5204 bytes
font_01_sfnt_off0000b060.bin
669294e728fd3965c7f3cdb4fa97c78b206eb069d6c326b4ce35616648a173d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB060 10112 bytes
font_02_sfnt_off0000d308.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD308 4324 bytes

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