Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff589ecc34d6241…

MALICIOUS

PDF

35.6 KB Created: 2020-08-11 07:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0249552f27c3ecbb48892ca0d89a98b SHA-1: 4c5c72897610e1525b3f66596f38d2499d986ea6 SHA-256: cff589ecc34d624186f6a4ff7fdd9ee0c619553924bbd81b702d0a075ac3b849
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.ru/pify?keyword=statistical+quality+control+eugene+grant+pdf, which is flagged as a malicious redirector. The document body, though partially corrupted, also contains this URL, suggesting an attempt to lure users to malicious content. The ML classifier strongly indicated maliciousness.

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=statistical+quality+control+eugene+grant+pdf
    • http://fuzif.appleseedsquares.com/uploads/1/3/1/4/131407089/wifinasulitozuketaj.pdf
    • http://files.cartooncaveman.com/uploads/1/3/1/6/131607029/5432260.pdf
    • http://files.atlanticconfederationofclubs.com/uploads/1/3/1/4/131454373/2f7cf6da4d0.pdf
    • http://files.firstgradebobcats.com/uploads/1/3/0/8/130814630/lidabapate-govoxezurito-gizimeli-gifotubagu.pdf
    • http://memagozir.patrickgfahey.com/uploads/1/3/1/3/131383314/sazetomojo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9477/7760/files/7962979786.pdf
    • https://cdn.shopify.com/s/files/1/0435/3110/8503/files/diagnostico_de_carcinoma_basocelular.pdf
    • https://cdn.shopify.com/s/files/1/0436/6375/3369/files/canara_bank_atm_card_application_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/44933811559.pdf
    • https://cdn.shopify.com/s/files/1/0433/9829/9813/files/gupewegezeparis.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/34131295529.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/difference_between_anova_and_t_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0021/files/princpios_da_administrao_pblica_resumo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5593/8720/files/jomopifoduzifoninuvakux.pdf
    • https://cdn.shopify.com/s/files/1/0439/2553/6936/files/biochemistry_final_exam_questions.pdf
    • https://cdn.shopify.com/s/files/1/0432/8197/3416/files/76374754178.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/gitalafefulomogovoxudilop.pdf
    • https://cdn.shopify.com/s/files/1/0437/7447/6440/files/89632759083.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_off00004b54.bin
569e57a0f0a474e46e22f7e941e6d6a75db2220f4ebcbaaffd48a94a0ee4842b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B54 5652 bytes
font_01_sfnt_off00005e99.bin
6daa387183632de3df1be4e5a93b77241f73c8a8765bc827bee79def607c0f64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E99 10448 bytes

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