Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdbebc80ce3969f…

MALICIOUS

PDF

36.1 KB Created: 2020-08-08 17:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38658e04128656c258d6fa9f174a0c32 SHA-1: 5882dfebfbd8f17182b11c4fa00fffbaf3865f9f SHA-256: ecdbebc80ce3969f8884f2e06a72bf96c79d3eba243fd257d2d397d0e567f42e
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a redirector at 'ttraff.ru'. The primary heuristic indicates that the PDF links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=saxon+algebra+1+online+textbook+pdf', suggesting a lure to a malicious site disguised as educational content. No scripts were extracted from this sample.

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=saxon+algebra+1+online+textbook+pdf
    • http://files.rootsthatrundeep.net/uploads/1/3/0/7/130776630/tidoropalavikijazis.pdf
    • http://files.thegoldpatrol.com/uploads/1/3/1/4/131453114/xasedafogajazija.pdf
    • http://gumero.bridgecreekfd.org/uploads/1/3/0/7/130739553/bukutoxin_nubuvebure_tukaluniwaw.pdf
    • http://toxabo.theurronstudio.com/uploads/1/3/1/3/131380600/woxituzafegakenaril.pdf
    • https://cdn.shopify.com/s/files/1/0428/1024/5279/files/parogizirezodasuruxetava.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9332/files/12426326405.pdf
    • https://cdn.shopify.com/s/files/1/0433/4046/4281/files/mumbai_society_bylaws.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fadanamimurusekebunom.pdf
    • https://cdn.shopify.com/s/files/1/0434/7658/2552/files/8925618139.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/42035839086.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/building_construction_books_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuwuvedalolavotidexetugom.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/propositional_logic_in_discrete_mathematics.pdf
    • https://cdn.shopify.com/s/files/1/0438/6072/1829/files/figudufes.pdf
    • https://cdn.shopify.com/s/files/1/0434/1897/6414/files/organes_de_l_appareil_digestif.pdf
    • https://cdn.shopify.com/s/files/1/0427/5775/0951/files/hingle_mccringleberry_gif.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_off00004cd5.bin
6f027c59e1c991cebbeade0290e1edff3c6cc861d68a4055405e9989b86afb88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CD5 5456 bytes
font_01_sfnt_off00005f7a.bin
c982c8a1807f1cd69e0a8f5dd8a30d4e81e57230a7ae34b43be6f307a8f8410c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7A 10540 bytes

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