Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff36368cd716628…

MALICIOUS

PDF

49.7 KB Created: 2020-08-23 02:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 312f1080ec3d74ff760938d8ad070f75 SHA-1: 2db1082f6c810efaaf52a1c574ed4aba73cf2349 SHA-256: cff36368cd7166287fa929efbe8b9e6c1532cc9fa8e2d577bd4f22c3def70af4
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of a large number of external PDF links suggests a link farm or SEO poisoning tactic to increase visibility. No scripts were extracted from this sample.

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=simple+algebra+equations+worksheet+pdf
    • http://lunefer.andrewantoniounow.com/uploads/1/3/0/8/130874075/cba3ef98ba5eb.pdf
    • http://files.oldlinereferees.org/uploads/1/3/1/8/131871518/9202653.pdf
    • http://dusiselib.awaredriving.com/uploads/1/3/2/7/132740405/1441378.pdf
    • http://files.jozzysratpackrattery.com/uploads/1/3/0/8/130813395/4bd25ca735.pdf
    • https://cdn.shopify.com/s/files/1/0434/9139/3702/files/bharat_movie_filmywap._in.pdf
    • https://cdn.shopify.com/s/files/1/0428/6991/5814/files/98252753435.pdf
    • https://cdn.shopify.com/s/files/1/0450/3171/9070/files/canned_fish_processing.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3871/files/kabowakiro.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/61648875195.pdf
    • https://cdn.shopify.com/s/files/1/0430/9434/3841/files/9_knowledge_areas_of_project_management.pdf
    • https://cdn.shopify.com/s/files/1/0437/1090/6518/files/factores_psicosociales_laborales.pdf
    • https://cdn.shopify.com/s/files/1/0437/9587/3949/files/38061066323.pdf
    • https://cdn.shopify.com/s/files/1/0433/4161/1159/files/73339419609.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/hipaa_guidelines_2018.pdf
    • https://cdn.shopify.com/s/files/1/0434/0675/3948/files/75883693774.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007431.bin
7f7077e98ac5575b5f8ff4f4edf4ca360ca6f8934b738845d13d66400a1c62ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7431 5860 bytes
font_01_sfnt_off000087ef.bin
e6796e1d6a2cce737d7cfb66eb6c6f75a90cf07b241122360136e083075cae1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87EF 10340 bytes
font_02_sfnt_off0000ab43.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB43 4324 bytes

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