Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fab782c67816a12…

MALICIOUS

PDF

55.9 KB Created: 2020-08-06 23:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1d7c976142f5c89db1cf960e556f12a SHA-1: bdfb0a269c82fdaf5a16228822e37b8eb5d9e232 SHA-256: 5fab782c67816a129140cd60e1af0350b1de27734a502176014671718a4cf050
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which likely leads to further 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.cc/pify?keyword=cabildo+abierto+definicion+pdf
    • http://files.problemsolvingmaps.com/uploads/1/3/1/4/131438708/nitogepol-mukamulix-sevixo.pdf
    • http://files.pursuitofyourroute.com/uploads/1/3/2/6/132681443/9ba94e053703fe2.pdf
    • http://files.alliekonkoldesign.com/uploads/1/3/2/6/132695578/vimudaxorodefokev.pdf
    • http://files.elizabethashdown.co.uk/uploads/1/3/1/3/131383426/8648151.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2086/9019/files/93570921687.pdf
    • https://cdn.shopify.com/s/files/1/0436/5297/2697/files/52233776594.pdf
    • https://cdn.shopify.com/s/files/1/0430/1488/1433/files/64243542132.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5356/files/faruleguzokebomepoli.pdf
    • https://cdn.shopify.com/s/files/1/0431/7691/9200/files/sadness_and_sorrow_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/logusugukozidopoderavopog.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/adobe_photoshop_tutorials_in_urdu_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/5195/8947/files/ruvalezowezulamoru.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/jekuxig.pdf
    • https://cdn.shopify.com/s/files/1/0431/8576/6564/files/juvamafakip.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_off00009999.bin
6fe07df58e8c7f723c12e5dc80482022ab74a11333980feaa045bb6a5aeca805
pdf-font-stream PDF embedded font (sfnt) at offset 0x9999 5016 bytes
font_01_sfnt_off0000aaac.bin
69e9b7a00db755209e5295e9f92da816c1093fc72743d4a2a70ce704265e3ae7
pdf-font-stream PDF embedded font (sfnt) at offset 0xAAAC 11968 bytes