Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac8d54141e1e0ac…

MALICIOUS

PDF

49.1 KB Created: 2020-08-08 18:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3880b82f69937d36db8ee9aa767209c SHA-1: 70ebb7782a711ab1aee1ac151e476ab858bdd4e2 SHA-256: 9ac8d54141e1e0acdbec90279a58b8a9ee52108c3437da409cba2a0e8968247c
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.cc/pify?keyword=centrifugal+blower+catalogue+pdf'. This suggests the document's primary purpose is to redirect users to a malicious site. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of a malicious redirector and a link farm indicates a social engineering 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.cc/pify?keyword=centrifugal+blower+catalogue+pdf
    • http://files.jjphotos.net/uploads/1/3/1/0/131069898/lewibiziw_bajisu_votok.pdf
    • http://files.landladyprosvcs.com/uploads/1/3/0/7/130739328/3645519.pdf
    • http://files.northpacificseafoods.com/uploads/1/3/1/4/131414743/tubuwidadujepud_xexadafokasefi_tesos.pdf
    • http://files.warlockwardrobe.com/uploads/1/3/0/7/130738876/bupevaribajaxo_tawizufuzo_nevirop_tilasudivawuvem.pdf
    • http://files.mediasourceamerica.com/uploads/1/3/0/7/130739719/4827329.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/cover_letter_for_teacher_job_application.pdf
    • https://cdn.shopify.com/s/files/1/0433/3872/7589/files/17427469890.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/metodo_facil_para_aprender_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0435/1806/6842/files/guligitofizasiwugesekuxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/notapi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/85197178005.pdf
    • https://cdn.shopify.com/s/files/1/0437/9715/1904/files/car_insurance_price_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/2971/7407/files/womabomug.pdf
    • https://cdn.shopify.com/s/files/1/0434/5289/1298/files/daxenuza.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8106/files/65057012344.pdf
    • https://cdn.shopify.com/s/files/1/0434/7117/5846/files/canon_dslr_1100d_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7867/1783/files/cash_flow_statement_problems_with_solutions.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_off0000798c.bin
dad562d1bf566ecb6766d10f94170c82dc2f7bccc81faa197472ac9dface84c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x798C 5280 bytes
font_01_sfnt_off00008b9e.bin
fbda197f318564f8d5f734a7c6089f9ecf789335efc6a7dbe4d8b309eb1623da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9E 13844 bytes

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