Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2bc0fcaa6140ea1…

MALICIOUS

PDF

53.5 KB Created: 2020-08-23 14:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 123ad80f19294985dc77a7e91c11a10f SHA-1: 6da67c03dd43d385a65f338f9c6eef647d5d96e3 SHA-256: c2bc0fcaa6140ea14780262df16adbc9f1df792e54237e747c70dd026336cab9
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=mathematical+induction+exercises+pdf'. This URL is presented within the document body, disguised as a link to educational content. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on cdn.shopify.com, suggesting an attempt to manipulate search engine results or distribute malicious links broadly. The ML classifier strongly indicates 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=mathematical+induction+exercises+pdf
    • http://vekel.southislandecebc.com/uploads/1/3/1/1/131163599/nuxiribalev.pdf
    • http://files.wildhorsesnevada.com/uploads/1/3/0/8/130874067/3089185.pdf
    • https://cdn.shopify.com/s/files/1/0434/3762/1404/files/maroz.pdf
    • https://cdn.shopify.com/s/files/1/0438/3955/3696/files/najoxamesuze.pdf
    • https://cdn.shopify.com/s/files/1/0438/2071/2098/files/degree_application_form_punjab_university.pdf
    • https://cdn.shopify.com/s/files/1/0432/4704/2715/files/ctet_exam_2020_answer_key_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7339/7145/files/afcat_2020_result.pdf
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/alopecia_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0673/files/54862261066.pdf
    • https://cdn.shopify.com/s/files/1/0436/1001/3853/files/funny_animated_video_song_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0428/9023/1974/files/hardware_inventory_management_excel_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/5587/3190/files/37177068958.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/86302776348.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/61655493747.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8265/files/mainframe_rexx_programming_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072be.bin
c503b0fd19cb110bda510d86982695f884952927501e3e483cd3a587f39c6c33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BE 5468 bytes
font_01_sfnt_off00008538.bin
ae74edf58714af38f04a6335967b6dc6cff782ed03f3dd2264fdd8d3d1011da1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8538 14456 bytes
font_02_sfnt_off0000b331.bin
6671a91e18bd15b2e7d5e74125a2c92502464edc3ed1bf5329086e28324a3661		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB331 16208 bytes

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