Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d50f3ec4e254d23…

MALICIOUS

PDF

44.8 KB Created: 2020-08-22 15:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebdd2e721d453140ee0bb60991c34572 SHA-1: 86a7298b15327f35aa38107a5e9040d463c448c6 SHA-256: 0d50f3ec4e254d23ca1579085cbbf9a77a67f6c7c432a92646f12966c9428a0e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure for software downloads, specifically 'Brackets software free for windows 7'. This indicates a likely phishing or social engineering attack aiming to redirect users to malicious sites.

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.cc/pify?keyword=brackets+software+free++for+windows+7
    • http://files.bbcphilly.com/uploads/1/3/2/6/132682070/zobujegele_butimukofetiga_tusap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3840/7845/files/84117742807.pdf
    • https://cdn.shopify.com/s/files/1/0438/2624/9885/files/10003109532.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4231/files/alphazero_chess_paper.pdf
    • https://cdn.shopify.com/s/files/1/0449/3633/1419/files/beautiful_day_u2_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0449/5890/8584/files/after_effects_cc_shortcuts.pdf
    • https://cdn.shopify.com/s/files/1/0448/2279/0305/files/haloalkanes_and_haloarenes_iit_jee_notes.pdf
    • https://cdn.shopify.com/s/files/1/0451/6829/6090/files/silvia_federici_caliban_and_the_witch.pdf
    • https://cdn.shopify.com/s/files/1/0437/3990/6209/files/15053264687.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/kodomoluzuku.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/pioneer_mvh_s218bt_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/1930/5113/files/air_camera_photo_editor_collage_filter_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/0018/4477/files/pdf_epub_to_kindle_tool.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_off0000702d.bin
3b815aa1d46469fd792bad8004d8d1e43444879da5e6553e51edbb29544ea1f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x702D 5268 bytes
font_01_sfnt_off00008240.bin
48968254e552e48be541f1dde4c39d9944b4c31e08ff5e260541e739f5f4b0d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8240 10700 bytes