Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c1ddc071de9a6f…

MALICIOUS

PDF

45.6 KB Created: 2020-08-08 06:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5d659a76e1a647e1cb96891a65c3c4f SHA-1: f1398c1e1cfca0479cc0039f0b641c553e2c6f17 SHA-256: 21c1ddc071de9a6f342efdbaa9b5d8f3eae0a4639ae24568782ff90acb663248
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating a link to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to potentially harmful websites.

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.com/pify?keyword=scientific+name+of+animals+plants+and+birds+pdf
    • http://files.reservoirmusiccenter.com/uploads/1/3/0/8/130874633/gupadojowa.pdf
    • http://files.ridgeandvalleyforest.com/uploads/1/3/0/7/130775017/6ac8ac68543e.pdf
    • http://files.gpsfirstaidtraining.com/uploads/1/3/1/4/131437862/ganasamuzitu.pdf
    • http://wuxav.designersonlyca.com/uploads/1/3/1/3/131383284/cd18c7ec5182.pdf
    • https://cdn.shopify.com/s/files/1/0439/1147/9464/files/drug_abuse_essay_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/19364942347.pdf
    • https://cdn.shopify.com/s/files/1/0446/9909/1098/files/modern_hebrew_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0438/2969/0528/files/18694010750.pdf
    • https://cdn.shopify.com/s/files/1/0428/1021/2519/files/4100761481.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1081/files/nazedo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/bsc_first_year_organic_chemistry_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/garemodaxizebonu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/wazusorutagatilelotudizi.pdf
    • https://cdn.shopify.com/s/files/1/0439/2108/0475/files/animal_coloring_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9381/files/36857015644.pdf
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/fiketivumenuxeji.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/65494162280.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_off00007322.bin
ce4b6e0f21a8d78a5d8f35e5afa82be4ea78976e82196224eca68b4b6194d228		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7322 5544 bytes
font_01_sfnt_off000085e4.bin
82ac49437a9be2de0e2ae251140084e2ed01f4935868ad5140f341aab5002a8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85E4 10260 bytes

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