Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b376bf2dc33d69…

MALICIOUS

PDF

46.8 KB Created: 2020-08-12 15:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 245200caeddbfedd0cece44bc2bea255 SHA-1: 923d63f215d38fb2fd12fe9f57faac67a29b9fb0 SHA-256: b8b376bf2dc33d69b0d36944b24d7ab3df7baa5170ff4f6493d34297d1863f08
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to domains associated with link farms and redirectors, including a critical finding of a link to known malicious infrastructure at 'https://ttraff.ru/pify?keyword=200+profitable+agribusiness+ideas+in+kenya+pdf'. The document body, though heavily obfuscated, contains references to the same URL and appears to be a lure for 'agribusiness ideas'. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is used for malicious redirection.

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=200+profitable+agribusiness+ideas+in+kenya+pdf
    • http://disofuvum.zimmermanfeedandgrain.com/uploads/1/3/1/0/131069934/mubov-tomiguzuf-dabewe.pdf
    • http://files.adrianrigby.net/uploads/1/3/0/7/130739772/8270084.pdf
    • http://files.pinsharpmarketing.co.uk/uploads/1/3/1/3/131382148/832613fe27707d.pdf
    • http://files.mthermonministries.org/uploads/1/3/1/1/131164424/favokuxemubumo_zosazuturojeli_vawafu_fikatomikaj.pdf
    • http://files.brucedelfosse.com/uploads/1/3/1/1/131164460/rugerotutamite_dodiwone_xexamenus.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/82413543284.pdf
    • https://cdn.shopify.com/s/files/1/0436/0221/5069/files/wipazimoburer.pdf
    • https://cdn.shopify.com/s/files/1/0432/4625/6295/files/68168730622.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8073/files/alpha_male_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1830/5179/files/urban_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tedogunugovosilogupex.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pejodogidevetakuranuwa.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/22928915625.pdf
    • https://cdn.shopify.com/s/files/1/0441/0785/8072/files/loworabenu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74098669839.pdf
    • https://cdn.shopify.com/s/files/1/0438/6127/8870/files/55819872918.pdf
    • https://cdn.shopify.com/s/files/1/0430/9457/3205/files/accounting_for_dummies_5th_edition.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_off00007813.bin
e08a79870d1077959f34bca5d64299049e9d953d2d8547fad3387e2d50942df0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7813 5696 bytes
font_01_sfnt_off00008b68.bin
bef9ea193bd1757858b7e64e713ec782f38470bc71b814692690324f7ec83be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B68 10032 bytes

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