Malicious PDF — malware analysis report

Static analysis result for SHA-256 13142335a0eea672…

MALICIOUS

PDF

50.4 KB Created: 2020-08-05 03:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad32b0c751831dc293dc002789f19f8b SHA-1: 4261046c2964341a60b159412a56ee840145e23f SHA-256: 13142335a0eea6720b4b2f5e4e8990dde55b8564a1681f2e3594ca15f9a5a6cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one critical heuristic identifying it as a redirector to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that matches the one flagged by the redirector heuristic. This suggests the PDF is designed to trick users into visiting a malicious site by appearing to offer free printables.

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=bullet+journal+printables+free+pdf
    • http://files.enneagramportland.com/uploads/1/3/2/7/132712302/sekefar.pdf
    • http://files.shopgingersgems.com/uploads/1/3/1/4/131438193/pogubomeru.pdf
    • http://files.zoesbluemoon.com/uploads/1/3/2/6/132681164/2187595.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2023/8503/files/jolifawetugatimelenidixo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1374/1471/files/mesixodojakokobo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1466/7934/files/xefewuwajipiwigunofosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/outlook_preview_handler_error.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/zavuwunufodino.pdf
    • https://cdn.shopify.com/s/files/1/0428/8780/7129/files/flatline_justin_bieber_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0434/2464/5272/files/diploma_automobile_engineering_books_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0433/1352/8987/files/32357725611.pdf
    • https://cdn.shopify.com/s/files/1/0430/8267/8433/files/67042157566.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/77763836512.pdf
    • https://cdn.shopify.com/s/files/1/0435/0256/7588/files/viresupawazunisezidusis.pdf
    • https://cdn.shopify.com/s/files/1/0431/0804/0853/files/lafedananowenireromaja.pdf
    • https://cdn.shopify.com/s/files/1/0429/7683/7785/files/bisas.pdf
    • https://cdn.shopify.com/s/files/1/0429/9387/7145/files/bikanafolagepemozodedogeg.pdf
    • https://cdn.shopify.com/s/files/1/0435/3572/8794/files/diweputofisabad.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080e1.bin
efccefb2cd95f7a55f9620202e19f503ef69fc39b5d87e9a1d4deb3e878b8b0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80E1 5300 bytes
font_01_sfnt_off000092f0.bin
c037426ff12c9fd4837c4893401702b9be3a2ca474f210ea9fa5763936910d47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92F0 12952 bytes

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