Malicious PDF — malware analysis report

Static analysis result for SHA-256 778793e486e74a57…

MALICIOUS

PDF

54.6 KB Created: 2020-08-26 22:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49114218eee571aaaa8116d4e2247065 SHA-1: efae1d7db3954b2f920ad02b9929b641a20fac6d SHA-256: 778793e486e74a57b9e24cfffa789e0c12b54607fe9e7a985069cb3f7b956d1f
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominently pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious URLs and the link farm structure strongly suggest a phishing or malware distribution attempt.

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=market+maker+signals+777
    • http://rerikepi.danhegstad.com/uploads/1/3/2/6/132681579/1613021.pdf
    • http://files.davidmartinsstyle.com/uploads/1/3/2/6/132682471/2414572.pdf
    • http://dojiju.christyokeeffe.com/uploads/1/3/1/4/131407668/92d3a.pdf
    • http://files.victorystrengthandfitness.net/uploads/1/3/1/3/131379111/3189598c68fd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/34270975335.pdf
    • https://cdn.shopify.com/s/files/1/0431/4116/9303/files/59535870883.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2680/files/cash_management_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/7539/3944/files/nbme_surgery_form_2_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/6309/6984/files/antilogarithm_table_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1961/5904/files/80285270410.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gekisemegudifusoledo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3113/2322/files/sankat_mochan_mahabali_hanuman_apnetv.pdf
    • https://cdn.shopify.com/s/files/1/0439/0692/4712/files/idiomatic_vocabulary_for_ielts_speaking.pdf
    • https://cdn.shopify.com/s/files/1/0432/8475/8696/files/zuriraforadu.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_off00008ddb.bin
e9e468df73a0c8dd1b984549386fbe483d99d9938a33f3394d11314b9bf4d454
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DDB 5156 bytes
font_01_sfnt_off00009f5b.bin
9f8df2a698827d4004623a0183055f1e1d5468e0e1f3a39d58357933fe24b3f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F5B 14708 bytes