Malicious PDF — malware analysis report

Static analysis result for SHA-256 707cb07020431332…

MALICIOUS

PDF

44.9 KB Created: 2020-08-03 11:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b55c2937c10216e4ea2c8f4afe39aa0 SHA-1: f6e9964b05e3dc8d8c57a9ae9d89757426ec0992 SHA-256: 707cb07020431332672ed6481b03b74052022faad1c671c722d44bbb9f355591
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. This indicates a link farm or SEO poisoning tactic designed to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector and link farm attack pattern.

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.com/pify?keyword=crecimiento+microbiano+fases+pdf
    • http://files.artvision.vip/uploads/1/3/0/9/130969681/3337761.pdf
    • http://files.encroixdanceacademy.com/uploads/1/3/1/4/131437515/95fae75b.pdf
    • http://files.thedwnews.com/uploads/1/3/2/6/132695543/9467457.pdf
    • http://files.lastanzadistefanie.com/uploads/1/3/0/9/130969762/db684a1.pdf
    • http://files.goodstuffbyshalonne.com/uploads/1/3/0/8/130814052/vesavidimenijem-tifibasezuv-gamitokepox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/davevim.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/55851206743.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/11159555754.pdf
    • https://cdn.shopify.com/s/files/1/0433/7516/5594/files/jozirevupifitikagajedef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30611133668.pdf
    • https://cdn.shopify.com/s/files/1/0433/9109/0844/files/lemutowosolimadu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5492/3925/files/vikovomabutujidavusik.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87743453122.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24370467333.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3001/files/zigefaxubat.pdf
    • https://cdn.shopify.com/s/files/1/0435/2881/4760/files/2_int_2._0_2_2_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/30300844102.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006263.bin
164896f03bf6b9260bdecde08ad3b5fae8bd7dfe2c5af4f4a66657ae72c2c416		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6263 5220 bytes
font_01_sfnt_off000073fa.bin
b70ff2f043786477b9e87bffca554585eba46710561ad9e2549635ba46da7ae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FA 10676 bytes
font_02_sfnt_off000096de.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96DE 4324 bytes

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