Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e28b26bf4020c5…

MALICIOUS

PDF

45.9 KB Created: 2020-08-22 09:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bf59e15d737f2042ba0b449c2236794 SHA-1: 2027940558e5c088bd282b9b1c9dda055695c517 SHA-256: 56e28b26bf4020c5af9c85716900c168733b3c96794caee66e9fec037f581702
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with the primary malicious link pointing to a redirector. The document body, though partially corrupted, suggests a lure related to a 'gout diet sheet in spanish'. The presence of numerous external links, many hosted on Shopify, indicates a link farm designed to distribute traffic to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious.

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=gout+diet+sheet+in+spanish
    • http://files.smporterauthor.co.uk/uploads/1/3/0/7/130775795/wezujewo_jopalejetonig_talesevasi_sunodojapakine.pdf
    • http://files.alsrace.nl/uploads/1/3/2/7/132711954/7350917.pdf
    • http://files.gnosuzukiforum.com/uploads/1/3/2/6/132695994/2d9df1d52f9ddc.pdf
    • http://files.roberttalksbusiness.com/uploads/1/3/2/6/132695651/gisinubelumide_tolunopibuwi_kipugip_voperunurabupor.pdf
    • https://cdn.shopify.com/s/files/1/0438/7107/6520/files/journal_article_format_example.pdf
    • https://cdn.shopify.com/s/files/1/0437/4380/5594/files/xivisazalebamuxezexilen.pdf
    • https://cdn.shopify.com/s/files/1/0437/7798/2626/files/65904013601.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7746/files/git_clone_permission_denied_publickey.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4483/files/34486639874.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/89634066202.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fadanamimurusekebunom.pdf
    • https://cdn.shopify.com/s/files/1/0452/1938/1399/files/adobe_acrobat_11_scan_to.pdf
    • https://cdn.shopify.com/s/files/1/0434/0393/5911/files/37894692703.pdf
    • https://cdn.shopify.com/s/files/1/0438/9906/0392/files/6824692079.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/auxiliary_verb_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/9625/1304/files/97221038836.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7319/files/16524165768.pdf
    • https://cdn.shopify.com/s/files/1/0432/1515/9458/files/silizosotuboladaxes.pdf
    • https://cdn.shopify.com/s/files/1/0429/5688/2086/files/84079172595.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_off000073ed.bin
b75270e393dd79de158273618accfe6b2867db8871b7b79d1d316464d2c107b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73ED 4948 bytes
font_01_sfnt_off000084bf.bin
ef49805593a4f2ce98e30b8b7c4bf5961e07593190dd9e1082b9ea72d4740303		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84BF 11084 bytes

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