Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd16617e7e260e8…

MALICIOUS

PDF

37.5 KB Created: 2020-08-20 04:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e764d606b707e90e0ba6970fd7c808b7 SHA-1: e7d7785c6233c28b84e609b52aa4dc24098d62dc SHA-256: ebd16617e7e260e887b4fde7d83c0ff2c1fab4e56634c1f4a50ed0a92977796d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a prominent link disguised as a school report, directing users to a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate the document's primary purpose is to distribute malicious links. The ML classifier also strongly flagged this PDF as malicious. The embedded URL points to a redirector that likely leads to further malicious content or phishing pages.

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=hawarden+high+school+ofsted+report
    • http://files.helenhassinger.com/uploads/1/3/1/6/131637056/joxefapi_fazopepo_vuwunutesizipes_wujizap.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/rogujob.pdf
    • https://cdn.shopify.com/s/files/1/0434/6888/2072/files/labemasutupopilik.pdf
    • https://cdn.shopify.com/s/files/1/0434/3955/4727/files/galuvezodafij.pdf
    • https://cdn.shopify.com/s/files/1/0445/6900/2143/files/84193530981.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9160/files/pete_s_dragon_2016.pdf
    • https://cdn.shopify.com/s/files/1/0432/6588/4323/files/50582971535.pdf
    • https://cdn.shopify.com/s/files/1/0450/6553/5638/files/mathematical_physics_by_ab_gupta_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/formal_bursary_application_letter.pdf
    • https://cdn.shopify.com/s/files/1/0435/3517/1738/files/arterial_hypertension.pdf
    • https://cdn.shopify.com/s/files/1/0432/0306/8068/files/pafuxuwezobukonulamejono.pdf
    • https://cdn.shopify.com/s/files/1/0435/5719/1843/files/22548655156.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/nezolazadutedofodefagab.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_off0000525d.bin
317ec974ccaa07c0c749073a575eca06b265b5e57b936e649f8b05080c1c9de0
pdf-font-stream PDF embedded font (sfnt) at offset 0x525D 5468 bytes
font_01_sfnt_off000064fd.bin
258a8a5f0057587dc17c9a4db45f715c5a55ceab23eb8f85386abd30456d174d
pdf-font-stream PDF embedded font (sfnt) at offset 0x64FD 10768 bytes