Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c31cf2532998b09…

MALICIOUS

PDF

37.1 KB Created: 2020-08-13 03:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee4f0da468921dc145b4c26e7877d22a SHA-1: d81ed1f4aa6a40dd511d73fc67146a5dd3e6df4f SHA-256: 1c31cf2532998b09d3a32bf42e4ca9d0278282089a50317a55a24c8bf942bb44
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate search results for educational materials. The primary link, https://ttraff.ru/pify?keyword=oxford+picture+dictionary+second+edition+workbook+pdf, redirects to malicious infrastructure, indicating a phishing or redirection attempt. The ML classifier strongly supports the malicious nature of this PDF.

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=oxford+picture+dictionary+second+edition+workbook+pdf
    • http://files.smithbrosplay.org/uploads/1/3/0/7/130739570/kujusuparejip-zovivumije.pdf
    • http://files.healthstartfoundation.org/uploads/1/3/0/9/130969974/8039667.pdf
    • http://files.attorneytallman.com/uploads/1/3/0/8/130813866/e070bbbfba.pdf
    • http://zeteduvi.appleridgecooperativehomes.com/uploads/1/3/0/7/130776445/6985718.pdf
    • https://cdn.shopify.com/s/files/1/0437/6385/9610/files/16400198720.pdf
    • https://cdn.shopify.com/s/files/1/0439/8986/0510/files/stop_questionnaire_sleep_apnea.pdf
    • https://cdn.shopify.com/s/files/1/0443/8137/2582/files/cooking_merit_badge_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/bisutar.pdf
    • https://cdn.shopify.com/s/files/1/0432/5235/1144/files/11342468500.pdf
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/livro_de_administrao_financeira_e_oramentria_para_concursos.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/fivifobavoz.pdf
    • https://cdn.shopify.com/s/files/1/0441/2493/0200/files/casadio_dieci_a2.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4679/files/30902157240.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_off00004f28.bin
4a38ae0a8553f8f6456eff23a9acf1ca88ced52163ccf1808702a17ef73f7c51
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F28 5612 bytes
font_01_sfnt_off0000626c.bin
614ef8539095c4498649aa62399c042e1ad849a0feb54f71ab22710af2ee24b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x626C 11272 bytes