Malicious PDF — malware analysis report

Static analysis result for SHA-256 2acf65475d4472ca…

MALICIOUS

PDF

41.3 KB Created: 2020-08-18 13:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce5e548dbe529811cd15b037008e7c69 SHA-1: 7dba8640d63dbf90e471f74dd884cbdbfa562168 SHA-256: 2acf65475d4472caf0dae7869bf75e7b26eb860615389b108f8ea9839e82f6f0
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to domains associated with link farms and redirectors, such as ttraffic.ru. The document body, though heavily obfuscated, contains the text 'Colouring fractions worksheet' and the URL 'https://ttraff.ru/pify?keyword=colouring+fractions+worksheet', suggesting a lure to educational content that redirects to malicious infrastructure. The ML classifier also 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=colouring+fractions+worksheet
    • http://files.onwardcatholicsoldier.com/uploads/1/3/1/4/131453028/jodazija-nisevenevenif.pdf
    • http://tiles.mounthollywood.org/uploads/1/3/1/3/131380600/jajegijupozivo.pdf
    • http://files.lindajluna.org/uploads/1/3/1/3/131384635/9441370.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/tomenakugegovovel.pdf
    • https://cdn.shopify.com/s/files/1/0431/0394/4853/files/definicion_de_historia_segun_autores.pdf
    • https://cdn.shopify.com/s/files/1/0434/5695/4518/files/sizusewisid.pdf
    • https://cdn.shopify.com/s/files/1/0439/0672/8091/files/pojotogo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/29620544781.pdf
    • https://cdn.shopify.com/s/files/1/0435/9149/9935/files/98238105684.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/fatotifudobobanofu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/desirifofafof.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/40821469294.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/anatomy_and_physiology_2_notes.pdf
    • https://cdn.shopify.com/s/files/1/0434/2651/3048/files/completing_the_square_maths_genie.pdf
    • https://cdn.shopify.com/s/files/1/0438/6239/2992/files/second_line_old_version_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/7795/8816/files/62857971706.pdf
    • https://cdn.shopify.com/s/files/1/0431/5676/6869/files/7.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_off000062d3.bin
d3952dbba5caa99aab32386ceabf00cb2507fd886bbfbaaec706c8fe1ad55c33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D3 5204 bytes
font_01_sfnt_off00007497.bin
84c58ccba8f19d9878fb2aa1c513665b934266db649568b6f88b5ec3719bb632		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7497 10444 bytes

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