Malicious PDF — malware analysis report

Static analysis result for SHA-256 acadc6d2be6ec566…

MALICIOUS

PDF

53.8 KB Created: 2020-08-30 08:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f15859eea44724524b80ea135301d1fb SHA-1: 729847cae062b37ed1ede77a78c403282d6168f2 SHA-256: acadc6d2be6ec56639f7dbea5fc02505f7e29584554f28504bf964bc1c079e9b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm heuristic, with numerous links pointing to Shopify domains, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is likely used to funnel users to a phishing or malware site.

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/wix?keyword=the+chicken+lead+sheet+bb
    • https://cdn.shopify.com/s/files/1/0447/8572/9685/files/fundamentals_of_financial_accounting_fred_phillips.pdf
    • https://cdn.shopify.com/s/files/1/0430/4538/8442/files/jurojuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0200/2595/files/kotegalemosozogotilok.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8577/files/65070594714.pdf
    • https://cdn.shopify.com/s/files/1/0432/5471/0427/files/aula_de_violo_em_para_iniciantes.pdf
    • https://cdn.shopify.com/s/files/1/0432/5959/2859/files/jimanodisadakoxasu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5649/5769/files/49452937996.pdf
    • https://cdn.shopify.com/s/files/1/0434/5335/0053/files/20950098935.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/41312795342.pdf
    • https://static.usrfiles.com/ugd/b8c837_9df7d9d097d94ef2922664db88ed94b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_439cb3377941494f903a4dad124ae329.pdf
    • https://static.usrfiles.com/ugd/10b11f_c9ae7147e7bd4439827d0a125a1274d4.pdf
    • https://static.usrfiles.com/ugd/8b2c09_26413d28c66b403d943c97385fd34698.pdf
    • https://static.usrfiles.com/ugd/d2cc1f_ef87200f1f8c4184b0c4415eeecc0c30.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_off00008349.bin
753051343e0723993772180a8e92bd82abffca57f59c3d052226789b65d12ee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8349 4792 bytes
font_01_sfnt_off000093dc.bin
74e6185136dd9d34cadcb5082668d2160fff2ea931c49b4711a30ab09a2c2a50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93DC 5084 bytes
font_02_sfnt_off0000a50e.bin
be461050075951d4f4716001b45a634feaf9ba23b421a2c7d0f33f290c15ed01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA50E 11044 bytes

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