Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a311e8b8a620a4…

MALICIOUS

PDF

40.0 KB Created: 2020-08-21 10:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8967412b4023c431822f01f4576a9aa SHA-1: fc1b233bae068bad824936d0d0f3a96642a1b7ba SHA-256: c5a311e8b8a620a428f095fa994eb5afb7e309365eb951302ad4bbbfdf6640e7
154 Risk Score

Malware Insights

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

The PDF file 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 numerous embedded URLs, including a suspicious redirector and links to Shopify-hosted PDFs, suggesting a campaign to distribute content through a large number of links. No scripts were extracted, limiting the analysis of direct execution capabilities.

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=cumulonimbus+clouds+form+in+stable+atmospheric+conditions
    • http://files.gethealthyknox.com/uploads/1/3/1/4/131438419/e14a01c8d7.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/fusafasisuxisewiwis.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9048/files/github_push_new_branch.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2944/files/loxejobojuzonuk.pdf
    • https://cdn.shopify.com/s/files/1/0460/1407/0945/files/brand_fusion_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0433/5838/8392/files/basic_c_programs_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/67343072871.pdf
    • https://cdn.shopify.com/s/files/1/0433/9482/6396/files/dhvani_bhanushali_vaaste_video_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9397/files/vepijalakokijed.pdf
    • https://cdn.shopify.com/s/files/1/0438/0835/8561/files/osha_30_answer_key.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_off00005e4b.bin
b42742f03dd4b146e79ec9f86b182ccfa9b7a50503cb9d68b1d3c77992a23609		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4B 5440 bytes
font_01_sfnt_off0000708b.bin
c84ed22d51e841e3360cf398cba6192e4ccfb73621f9fb74947a8827b2595103		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708B 10140 bytes

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