Malicious PDF — malware analysis report

Static analysis result for SHA-256 78331b80395d570a…

MALICIOUS

PDF

32.9 KB Created: 2020-08-02 20:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 006fe8f775463a9319b39f3bf0bae880 SHA-1: a1c4e36737ba670e963bdb4050184e9d556c1d28 SHA-256: 78331b80395d570a9f1b85013be17ccfb81bca4c8abb0f2d82f335baf40cf777
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged as malicious by an ML classifier and contains a link farm pointing to numerous external PDF files, including a known malicious redirector. The document body, though heavily obfuscated, contains URLs that are likely part of this link farm. This suggests an attempt to manipulate search engine results or redirect users to malicious content.

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=moldes+fofuchas+pdf
    • http://files.bemisfarmsnursery.com/uploads/1/3/2/3/132303099/taxiwobomedogofene.pdf
    • http://files.broadwaypinups.com/uploads/1/3/0/8/130813765/8391871.pdf
    • http://files.adewaleadeyeyeauthor.com/uploads/1/3/0/8/130874115/6343663.pdf
    • http://files.raghuananthanarayanan.com/uploads/1/3/1/4/131407292/1632715.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4224/1688/files/tuwidepo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2030/3006/files/zuzagololamifawoko.pdf
    • https://cdn.shopify.com/s/files/1/0430/8228/5216/files/ganuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/8272/7067/files/sulepotujizipuwalij.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1458/files/43989115382.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9509/files/dinasevutesemogewakom.pdf
    • https://cdn.shopify.com/s/files/1/0441/2299/6888/files/74615344460.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/75809858461.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/pover.pdf
    • https://cdn.shopify.com/s/files/1/0429/1896/9507/files/55032653462.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/9756917230.pdf
    • https://cdn.shopify.com/s/files/1/0428/7922/1927/files/9283139351.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004611.bin
5956db0da22ee8ef15ab6f4647c57fa7388c07a1807b7471a8651c33d37afce7
pdf-font-stream PDF embedded font (sfnt) at offset 0x4611 5152 bytes
font_01_sfnt_off000057a9.bin
e637c318b9a96960832650335f004e56137f566a296fccaec7a0820af783c833
pdf-font-stream PDF embedded font (sfnt) at offset 0x57A9 9460 bytes