Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9a5b1436155ae6…

MALICIOUS

PDF

46.7 KB Created: 2020-08-11 22:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f81a3633f5ee2ca8c80c7a2b591e56ff SHA-1: c6a42ae60ee5b67b1a60860d18d1a42d2fa8565e SHA-256: ba9a5b1436155ae6ac771b8800fb79b98298f497735f045ac05f9bee4ec552d5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to what appears to be a link farm designed for SEO manipulation. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=understanding+biblical+theology+a+comparison+of+theory+and+practice+pdf'. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains this same URL, suggesting the primary intent is to redirect the user to malicious infrastructure.

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=understanding+biblical+theology+a+comparison+of+theory+and+practice+pdf
    • http://files.donnellamonk.com/uploads/1/3/1/6/131606923/nalow_foganozab_pusobubozu.pdf
    • http://files.millsidestables.com/uploads/1/3/0/8/130813985/kafopoxivixi.pdf
    • http://files.augsburgtoledo.org/uploads/1/3/0/7/130776602/rejukem.pdf
    • http://files.vibrant-energies.com/uploads/1/3/0/7/130775980/pawanetamonuvisera.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37263727017.pdf
    • https://cdn.shopify.com/s/files/1/0431/2865/1938/files/getotereduxijutukefuwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4179/9843/files/44509385137.pdf
    • https://cdn.shopify.com/s/files/1/0432/1578/2048/files/swing_trading_with_options.pdf
    • https://cdn.shopify.com/s/files/1/0436/3337/7440/files/gujutipizoliwokuke.pdf
    • https://cdn.shopify.com/s/files/1/0433/5871/6054/files/62766248379.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/metefori.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/17318018968.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1320/files/11609306627.pdf
    • https://cdn.shopify.com/s/files/1/0437/5746/9845/files/fexoxipimope.pdf
    • https://cdn.shopify.com/s/files/1/0433/5940/4197/files/mabamebudofurasu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7305/files/catlogo_jequiti_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1989/files/ruxebuwolubu.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_off000075df.bin
588a9b8adb483ba4a56da23608c18d8bdabb15a00b497b7f87f96b9bfc4f8f3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75DF 5800 bytes
font_01_sfnt_off0000896d.bin
4fe835f31bbeb825919be69788771e01480f05dcc8a6b31c108a6b72d04a3ef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x896D 10288 bytes

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