Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ea53737648fb1a…

MALICIOUS

PDF

45.0 KB Created: 2020-08-15 01:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c866d0c9a60667a886794135c8c47c80 SHA-1: 69625d827ea5ad6b204a2930ca40f57e04a18c99 SHA-256: b5ea53737648fb1a487f2502f873e18da7394b723fd480a8e0251367e17cedf0
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is used to deliver a file named 'orbit er setup.exe free'. The document body also contains this URL and filename, reinforcing the lure. The PDF also hosts a large number of external links, many pointing to Shopify, which is indicative of a link farm used for SEO poisoning to attract victims. The ML classifier strongly flagged this PDF as malicious.

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=orbit+er+setup.+exe+free
    • http://gebub.stmarysclinic.net/uploads/1/3/1/3/131398244/7e67c86fc41ab.pdf
    • http://files.ramirezpecanfarm.com/uploads/1/3/1/6/131636746/kisopijesefizu-rupuwanugixod-xumozamigut-lavojarosenew.pdf
    • https://cdn.shopify.com/s/files/1/0438/4564/8546/files/83930108976.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/16765622474.pdf
    • https://cdn.shopify.com/s/files/1/0437/9371/1261/files/lojubapisabuxokojex.pdf
    • https://cdn.shopify.com/s/files/1/0441/3263/0680/files/gobadeboson.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3773/files/razalodege.pdf
    • https://cdn.shopify.com/s/files/1/0449/3679/0171/files/basic_arabic_words.pdf
    • https://cdn.shopify.com/s/files/1/0434/3765/4178/files/marcelo_quiroga_santa_cruz.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_off00006c78.bin
e07a96efde591f6ee9a1ecd9f857cadcca32da4b36d160d66df3f90b5b95c83f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C78 4920 bytes
font_01_sfnt_off00007d51.bin
acb1a6f0a834c8f9418ba47765a12d414f9c1af8d4f8772360e7eaf7937c9730		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D51 13144 bytes

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