Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b563a3af7a8fdf6…

MALICIOUS

PDF

43.4 KB Created: 2020-08-08 06:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d624aa8e09fff526bb8d760b2a67adb SHA-1: 5394e0f57ce6b407865588bf5387be47481857ba SHA-256: 5b563a3af7a8fdf6597771aaaf196a9300cb3926800acb7c2e502de1d89ce834
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially obfuscated, contains text suggesting it is a 'lesson plan sample', which is a common lure. The presence of numerous external PDF links also indicates a link farm, likely for SEO manipulation or further distribution.

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.com/wb?keyword=7es%20lesson%20plan%20sample%20pdf
    • http://files.planninginblackandwhite.com/uploads/1/3/2/7/132710655/bobuzugipiz_renele_litazafurusagop.pdf
    • http://files.skanlabnorge.com/uploads/1/3/1/3/131398139/vonepovufefibo.pdf
    • http://files.arcofcentralplains.org/uploads/1/3/1/4/131406181/telagefugur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1395/6006/files/starwind_v2v_converter.pdf
    • https://cdn.shopify.com/s/files/1/0450/2949/0838/files/formulaire_attestation_pole_emploi_vierge.pdf
    • https://cdn.shopify.com/s/files/1/0435/9494/0573/files/wowajizuxox.pdf
    • https://cdn.shopify.com/s/files/1/0434/5331/7272/files/genesis_bible_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22700630349.pdf
    • https://cdn.shopify.com/s/files/1/0427/5693/1751/files/treatment_for_oral_lichen_planus.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7207/files/9797697216.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/gozitekikiwowifej.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/excuse_me_kevin_gates_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/7780/3931/files/tutumaragujajara.pdf
    • https://cdn.shopify.com/s/files/1/0440/5824/7320/files/vudaf.pdf
    • https://cdn.shopify.com/s/files/1/0441/4016/7320/files/kefibizagonosoborejato.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_off00006c34.bin
4eecf865ba25aa683fa04462c5773cf47964431f25a6818b92d190f1f375fc5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C34 5076 bytes
font_01_sfnt_off00007d6f.bin
98c333a54941bfeed57ab9b7dcf84b49e2f36b44979c19c90c47b996b837016f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D6F 10700 bytes