Malicious PDF — malware analysis report

Static analysis result for SHA-256 095873ee9f0b74e7…

MALICIOUS

PDF

47.3 KB Created: 2020-08-05 01:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b28979547c68a31ae258d71c2aad1ef SHA-1: 48c6c3de088ed165725c2a3d6b8c2ef21d0508c6 SHA-256: 095873ee9f0b74e707c4d4568fea74cec756c2dc1f494c8716e1adc3ac5baf1c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector URL, indicating a malicious intent to lead users to potentially harmful content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a SEO poisoning or link farm tactic. The document body itself contains the primary malicious URL, disguised as a download link for a dictionary.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=oxford+dictionary+english+to+gujarati+free+download+pdf+file
    • http://files.nsi4africa.com/uploads/1/3/1/4/131408245/ae29cb0e.pdf
    • http://files.stmichaelsworkington.org/uploads/1/3/1/3/131381112/seket.pdf
    • http://files.novapublishers.net/uploads/1/3/1/8/131857117/13033d9a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4405/9806/files/annabac_maths_terminale_s.pdf
    • https://cdn.shopify.com/s/files/1/0441/3535/0424/files/kasupepi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5152/2977/files/xalefofatetiwususutib.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/10402065307.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8298/files/80324339745.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6624/files/niroferunojapesonewekid.pdf
    • https://cdn.shopify.com/s/files/1/0439/1901/6104/files/nosidajodilupulukoku.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9759/files/learn_autocad_basics_in_21_days_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4418/3970/files/zexivabajejerawev.pdf
    • https://cdn.shopify.com/s/files/1/0436/2171/2034/files/me_state_abbreviation.pdf
    • https://cdn.shopify.com/s/files/1/0433/8361/9738/files/attestation_de_stage_maroc.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/fizabefepuk.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_off00006c2c.bin
b94f62ee44fc8e3009aa1b8d76e9d37bffe525ad4b39f7561353746d3f681317		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2C 5784 bytes
font_01_sfnt_off00007ff7.bin
130dddb3b9b3f6673cee3954906a586c2e5920dcc156aefc0c0bd59e445d7a5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF7 15348 bytes

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