Malicious PDF — malware analysis report

Static analysis result for SHA-256 0827a2789776c140…

MALICIOUS

PDF

44.9 KB Created: 2020-08-07 05:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60352c0d70163437e58d1e636247198c SHA-1: 6640ee9b75e4db418e322cbf4ed4199d0b6e69a1 SHA-256: 0827a2789776c140d20a07fc9abc594fe41080c29ae24dd73e0ac2c5b60983ac
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector, disguised as a legitimate document download. The ML classifier strongly indicated maliciousness, and the presence of a redirector suggests an attempt to lead the user to a malicious site. While no scripts were directly extracted, the PDF structure and embedded links are indicative of 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=big+data+analytics+for+cloud+iot+and+cognitive+computing+pdf+download
    • http://gatimado.littleprayersforlittlefolks.com/uploads/1/3/1/3/131383657/f5beea82f.pdf
    • http://files.thefootrailstore.com/uploads/1/3/1/4/131452878/3550964.pdf
    • http://files.redfoxteas.com/uploads/1/3/0/8/130814346/sepitibijum.pdf
    • http://files.cwl-asheville.org/uploads/1/3/1/4/131452735/ab4c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4270/8378/files/breathing_underwater_hiatus_kaiyote.pdf
    • https://cdn.shopify.com/s/files/1/0431/6594/1917/files/dadujukiverariwimaka.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0497/files/mawedukukagixukot.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5309/files/mekunipenariso.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/vidifesasijotawukiwisak.pdf
    • https://cdn.shopify.com/s/files/1/0444/7302/4679/files/discord_best_role_colors.pdf
    • https://cdn.shopify.com/s/files/1/0438/1710/7616/files/61925766464.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5235/files/wotesakaxetodo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/65568604542.pdf
    • https://cdn.shopify.com/s/files/1/0438/1786/1277/files/likabezunesunim.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0520/files/46704329969.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/46355672464.pdf
    • https://cdn.shopify.com/s/files/1/0435/0866/2440/files/47181765344.pdf
    • https://cdn.shopify.com/s/files/1/0431/4782/1205/files/wanemalejalitaja.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_off00006d31.bin
3f2d3589c8148ec7e4bf3eb85601c15913b0217353388006d812061df046cc3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D31 5776 bytes
font_01_sfnt_off000080f1.bin
248ac5e4751a74fba8aa0b5b480e92c3efb5df4ed9cd72a07e687ef2a544e633		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80F1 10892 bytes

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