Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e09f7ff825afb8…

MALICIOUS

PDF

38.7 KB Created: 2020-08-09 18:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db181bece823ce10028b3f53f5e5aa23 SHA-1: 0b65b991fb2b21b45d8a83a05db139b92b852e29 SHA-256: d1e09f7ff825afb8e51de20cff95cb0a051d4abb7a4c1fb70172def3a5100024
152 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, specifically pointing to 'https://ttraff.cc/pify?keyword=academy+stars+teacher+s+book+pdf'. This indicates the document's primary purpose is to redirect users to potentially harmful content. Additionally, the PDF hosts a large number of external links, many of which are to Shopify domains, suggesting a link farm or SEO manipulation tactic to obscure the malicious redirector. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence of malicious intent.

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.cc/pify?keyword=academy+stars+teacher+s+book+pdf
    • http://files.psychometricdynamics.com/uploads/1/3/1/3/131382032/4e6f419d31e.pdf
    • http://paves.equityingenetics.com/uploads/1/3/0/7/130775062/d7a61a7b884f3.pdf
    • http://files.honeybeeandblossom.com/uploads/1/3/1/4/131453540/sirejidavijada.pdf
    • http://tudif.monitheseries.com/uploads/1/3/0/8/130814328/tikuzoriwafigom-sedefo-viletifo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9756/files/7495933264.pdf
    • https://cdn.shopify.com/s/files/1/0435/4942/5823/files/95663993866.pdf
    • https://cdn.shopify.com/s/files/1/0440/4799/0934/files/balelodabojogazo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3776/1437/files/webx_document_loader.pdf
    • https://cdn.shopify.com/s/files/1/0437/1644/4311/files/pemarirulekisa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6412/files/aptitude_test_questions_and_answers_for_bank_exams.pdf
    • https://cdn.shopify.com/s/files/1/0438/5059/6512/files/44968312484.pdf
    • https://cdn.shopify.com/s/files/1/0430/1520/9123/files/delta_bench_band_saw.pdf
    • https://cdn.shopify.com/s/files/1/0441/1781/9544/files/razer_synapse_login.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/69135245054.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/danedogorolulefumatexa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8921/5129/files/teori_urbanisasi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/swing_trading_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0392/files/57873042487.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_off000057ed.bin
77e4219c62acb9080c92aebd65ecac01057419485960ee38b3015d452617b42f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57ED 5660 bytes
font_01_sfnt_off00006b08.bin
a17607a14cd582bdb74a1b0d33b040d13ed42064515e36b47ec30026dc37ace0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B08 10172 bytes

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