Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9c6648343de851…

MALICIOUS

PDF

44.6 KB Created: 2020-08-18 20:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1932a13a184845b71a45b97fa245965c SHA-1: 0f33e6965730c5f285b727f8f9e6d411a8f342db SHA-256: be9c6648343de851d5ab23c37d97a81310860913176d67646375d3deec4d3020
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a link farm designed to redirect users to malicious sites.

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=bluestacks+win+8
    • http://files.ivesart.com/uploads/1/3/0/7/130740589/3180836.pdf
    • https://cdn.shopify.com/s/files/1/0438/9991/2344/files/final_fantasy_7_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/wabidabokoji.pdf
    • https://cdn.shopify.com/s/files/1/0434/4548/5725/files/medoroxotazaguwidi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9826/8065/files/biophysics_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2040/files/boxomegipofepag.pdf
    • https://cdn.shopify.com/s/files/1/0436/9602/9864/files/xejobotuzologitumozapub.pdf
    • https://cdn.shopify.com/s/files/1/0432/8564/3420/files/english_grammar_in_gujarati_angel_academy.pdf
    • https://cdn.shopify.com/s/files/1/0429/5013/1878/files/british_council_english_test.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/27048324408.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/pisutavelawivimazi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/26771823598.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_off00007204.bin
604764260193d453662437ddd8478d412151c85419334f4c2eb93d8e0bff9806		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7204 5096 bytes
font_01_sfnt_off0000837d.bin
5eadc3429e08d4571ff94e28c6a3e5feaa09b1ae0e36c683099797ed5c44bd45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x837D 10404 bytes

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