Malicious PDF — malware analysis report

Static analysis result for SHA-256 0279907ca88cc022…

MALICIOUS

PDF

46.1 KB Created: 2020-08-08 06:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd8309a773c8b35e29961e024ed8cf77 SHA-1: 57c52ee759737bfa95c319d7ebf27cafc48b9429 SHA-256: 0279907ca88cc0222f4c567395ad7a8a595b1858bda0d263e4f9b7f6e02c4d2d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic, suggesting an attempt to lure users to malicious content. No scripts were extracted, but the presence of embedded links points to a phishing or redirection attack.

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=br%25C3%25BCche+regeln+pdf
    • http://files.mycupidclothing.com/uploads/1/3/0/7/130775556/8720055.pdf
    • http://files.tlfamilydetective.com/uploads/1/3/0/7/130739826/3382453.pdf
    • http://files.rivercliffestates.com/uploads/1/3/1/4/131438499/7897259.pdf
    • http://files.russellvanecek.com/uploads/1/3/2/6/132681501/4916379.pdf
    • http://files.integritycincinnati.com/uploads/1/3/1/4/131438835/7891521.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4211/0631/files/bible_history_old_testament.pdf
    • https://cdn.shopify.com/s/files/1/0429/8348/9687/files/kolomilifudazig.pdf
    • https://cdn.shopify.com/s/files/1/0431/7233/1675/files/purutediv.pdf
    • https://cdn.shopify.com/s/files/1/0431/2684/9700/files/opsc_assistant_section_officer_exam_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/5349/8019/files/logupiwezibirovokux.pdf
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/sizuronitovel.pdf
    • https://cdn.shopify.com/s/files/1/0435/4097/1674/files/26335884137.pdf
    • https://cdn.shopify.com/s/files/1/0433/5969/9109/files/dosowe.pdf
    • https://cdn.shopify.com/s/files/1/0435/1184/0927/files/27395343555.pdf
    • https://cdn.shopify.com/s/files/1/0433/4954/1013/files/treatment_of_meconium_aspiration_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0429/8761/8463/files/66407598008.pdf
    • https://cdn.shopify.com/s/files/1/0439/4817/9611/files/37958790936.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_off00006b47.bin
7f4d64e9e4a87ab746d43cf133ddf1a85dcb044514bfd7199c586596bb4495c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B47 5196 bytes
font_01_sfnt_off00007cc3.bin
4ee132746045e7fe65ff98f9288a855992822a3d2638aa960d5621b8f78bab91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC3 14684 bytes

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