Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fce25ddd1bb91c…

MALICIOUS

PDF

41.9 KB Created: 2020-08-11 20:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e21d0c119763be7ef027f2dec24a423b SHA-1: 45fb113dad1956d4b674556d8d97a12a546946c7 SHA-256: 23fce25ddd1bb91c61c8469ae6df29a018d4c6db9fe59aec49ee4d71de13d033
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link disguised as 'interview questions for production manager pdf' which redirects to a malicious URL. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms this, and the ML_NYX_PDF_MALICIOUS score is extremely high. The document body is heavily obfuscated but contains the malicious URL and numerous other URLs, likely part of a link farm to improve search engine ranking for the 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/wb?keyword=interview%20questions%20for%20production%20manager%20pdf
    • http://vidaku.enhanceosteopathy.com.au/uploads/1/3/1/6/131606289/sovatiwaraniz_pujufunug_felirojibiwe.pdf
    • http://files.gingerscandlecompany.com/uploads/1/3/0/7/130775403/686b7eee.pdf
    • http://files.pentecostalcchurch.com/uploads/1/3/0/9/130969708/bewevenip-dufafudobu.pdf
    • http://files.cortneydenman.com/uploads/1/3/0/8/130874633/1642195.pdf
    • http://files.nlpandmbitcoach.training/uploads/1/3/0/7/130738917/9747528.pdf
    • https://cdn.shopify.com/s/files/1/0433/4321/6789/files/kekasekad.pdf
    • https://cdn.shopify.com/s/files/1/0429/6628/6490/files/tazewixe.pdf
    • https://cdn.shopify.com/s/files/1/0445/4989/8399/files/aprender_a_tocar_violo_sozinho.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/nisitupudow.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/92627128390.pdf
    • https://cdn.shopify.com/s/files/1/0437/7952/2714/files/retifexiwibegole.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/ba_2nd_year_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/ascent_of_sap_theories.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/1497932933.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/plotting_rational_numbers_on_a_number_line.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1357/files/bokan.pdf
    • https://cdn.shopify.com/s/files/1/0440/7197/7110/files/.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_off000065f2.bin
fd41bf93a4b54d0ec93c5d1f0aaacf90ca9fa09b251f54049471f3f2b8885303		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F2 5660 bytes
font_01_sfnt_off00007924.bin
e1f679da8fd674cd53c527044440796b26d7e8e3dc6a17bed253ab6f605fe677		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7924 9716 bytes

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