Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bd4eee3fa69242…

MALICIOUS

PDF

58.4 KB Created: 2020-08-08 19:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ec9e945a687dc54b0fbae68a9bde536 SHA-1: fb49cf0edc09970cb70349a6469cb7aeea060e5f SHA-256: 36bd4eee3fa6924205b2133358762aa638a55938b96b2e7fc426e507603560fd
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous embedded links to external PDF files, with one link pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness. The primary attack pattern involves leveraging these links, likely for SEO manipulation or to distribute further malicious content.

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=structure+of+boranes+pdf
    • http://files.mayalissa.com/uploads/1/3/0/7/130739525/gudaruxipanagim_mozog.pdf
    • http://files.ellewyant.com/uploads/1/3/1/6/131637014/jopelozodumu-dirivodiboxu-jovat.pdf
    • http://files.diversitee123.com/uploads/1/3/2/8/132814138/bapekijoba.pdf
    • https://cdn.shopify.com/s/files/1/0432/1614/2497/files/voruwitovowumovej.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/60801339947.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/ugly_s_electrical_reference_2017_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/fedopimomot.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/41623334701.pdf
    • https://cdn.shopify.com/s/files/1/0432/8806/8254/files/vegexakadiwugozim.pdf
    • https://cdn.shopify.com/s/files/1/0431/7803/3313/files/tubugi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0781/8398/files/30635416517.pdf
    • https://cdn.shopify.com/s/files/1/0432/7328/9894/files/bankers_adda_gk_capsule_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7008/7587/files/37713777100.pdf
    • https://cdn.shopify.com/s/files/1/0429/1480/7974/files/brief_calculus_and_its_applications.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f24.bin
d2077f5d6d5b1d677d9b6d000eb087611a047961d42ceeb980acba3b54af8b85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F24 6492 bytes
font_01_sfnt_off00008f59.bin
8d6dccdeb4aada6393ac06c7baabd7052f406e086bbbf2c7e898ba7588ceb241		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F59 5360 bytes
font_02_sfnt_off0000a19b.bin
005f5db98860299918f7f510eebedcb0f6e45c799d4094ff339f288427425afe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA19B 10976 bytes
font_03_sfnt_off0000c772.bin
01e49661dbdd7b4823267156d85e4b6ddc25a6de2ac0af4d78c137cfa2b371b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC772 16100 bytes

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