Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81eff6732505cb9…

MALICIOUS

PDF

41.5 KB Created: 2020-08-30 11:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd338f7958dfc3929abd3596a30243e9 SHA-1: 747aa4920afcbe29093eaf4d495af302d9fdf0ea SHA-256: e81eff6732505cb91d8650841622892be0d2b20519fe9815b7425d79ed720ef0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by a critical heuristic for linking to known malicious redirector infrastructure and for containing a mass external PDF link farm. The ML classifier also strongly indicated maliciousness. The embedded URL https://ttraff.cc/wix?keyword=massachusetts+foundations+of+reading is a primary indicator of malicious intent, likely serving as a redirector to further malicious content. The large number of shopify.com links suggests an attempt to manipulate search engine results or distribute content through seemingly benign platforms.

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/wix?keyword=massachusetts+foundations+of+reading
    • https://cdn.shopify.com/s/files/1/0433/7057/8070/files/64033954207.pdf
    • https://cdn.shopify.com/s/files/1/0438/0088/7457/files/88564976873.pdf
    • https://cdn.shopify.com/s/files/1/0434/4276/5991/files/xatabipajoda.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/79486650092.pdf
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/89912555515.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5219/files/94787544745.pdf
    • https://cdn.shopify.com/s/files/1/0435/9516/9950/files/xaxomujutagijefokad.pdf
    • https://cdn.shopify.com/s/files/1/0436/2846/2243/files/see_if_someone_blocked_you_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0427/8494/8380/files/10857267053.pdf
    • https://cdn.shopify.com/s/files/1/0430/6056/0021/files/tigipoveru.pdf
    • https://cdn.shopify.com/s/files/1/0434/8408/6429/files/como_aprender_a_dibujar_paso_a_paso.pdf
    • https://cdn.shopify.com/s/files/1/0448/0450/5760/files/xulalikedozasabi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/sides.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/55019470366.pdf
    • https://cdn.shopify.com/s/files/1/0434/0973/5845/files/pumobiza.pdf
    • https://cdn.shopify.com/s/files/1/0435/4496/9367/files/gazavotiziditazasit.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_off000062ed.bin
8bfcca9e64dda957c0e34f6ef6e743abeebf105f526aba4aa7b5fe3acb7e8e3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62ED 5256 bytes
font_01_sfnt_off000074c4.bin
a4955a98b19fd4687de9ad84499e41b2f7bb62d5314765ea86cca606edf00d0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C4 10648 bytes

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