Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf1ef9b47651fc8…

MALICIOUS

PDF

46.0 KB Created: 2020-08-08 18:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb0915be5c57511ee5e6694a010c64f2 SHA-1: 6a82d3ee65637b0439059a5c4d060482bafbb0e1 SHA-256: 1cf1ef9b47651fc889455c6d5842a435327df41e775ccde37f61a6671e8607c2
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on 'cdn.shopify.com' and other domains, suggesting a link farm or redirection strategy. The ML classifier also strongly indicated maliciousness.

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=adobe+illustrator+logo+design+tutorials+for+beginners+pdf
    • http://files.erica-baltimore.org/uploads/1/3/1/4/131437889/budena.pdf
    • http://files.galaxymt.com/uploads/1/3/1/3/131380354/jaxalu.pdf
    • http://files.endeavoursporting.com.au/uploads/1/3/0/7/130776518/161606aa6ef1406.pdf
    • https://cdn.shopify.com/s/files/1/0435/1092/3423/files/gimakujijapopewu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4024/files/49826012953.pdf
    • https://cdn.shopify.com/s/files/1/0431/4716/5850/files/butarepurexuma.pdf
    • https://cdn.shopify.com/s/files/1/0437/5491/3943/files/perububikuna.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/tratamiento_de_amigdalitis_en_adultos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pafinekumukomotutawewokab.pdf
    • https://cdn.shopify.com/s/files/1/0432/5569/3470/files/free_prepper_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/9397/3405/files/vevetas.pdf
    • https://cdn.shopify.com/s/files/1/0433/5871/6054/files/18737721602.pdf
    • https://cdn.shopify.com/s/files/1/0433/3810/5000/files/59099505855.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3735/files/nuwalisesevuzuwibefulopa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/71006000517.pdf
    • https://cdn.shopify.com/s/files/1/0428/6935/8758/files/sorcerer_wild_magic_table.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_off00006806.bin
a526caa0a5731f05b871309d60f4d8d9012a7861a31292af5d92ed58a772ec8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6806 5220 bytes
font_01_sfnt_off000079cb.bin
ae981c1b5df9b345962df0423416213f324fca07a3e70b3ec548c1784c13f5da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79CB 10120 bytes
font_02_sfnt_off00009c71.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C71 4324 bytes

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